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A heat sink mounting device includes a touching plate and a mounting member. The touching plate defines a locking hole. The mounting member includes a locking post. The locking post includes a body and two protrusions protruding from the body. An inner surface of the locking hole defines two cutouts

A heat sink mounting device includes a touching plate and a mounting member. The touching plate defines a locking hole. The mounting member includes a locking post. The locking post includes a body and two protrusions protruding from the body. An inner surface of the locking hole defines two cutouts. The touching plate includes two blocking blocks extending from an edge of the locking hole on a bottom surface of the touching plate. The two protrusions extend out of the two cutouts and abut the bottom surface of the touching plate. One of the two protrusions is located between the two blocking blocks, to prevent the body from rotating freely in the locking hole.

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1. A heat sink mounting device, comprising: a touching plate defining a locking hole; anda mounting member comprising: a locking post comprising a body, a limiting portion located on the body, and two protrusions protruding from the body; anda spring surrounding the body;wherein an inner surface of

1. A heat sink mounting device, comprising: a touching plate defining a locking hole; anda mounting member comprising: a locking post comprising a body, a limiting portion located on the body, and two protrusions protruding from the body; anda spring surrounding the body;wherein an inner surface of the locking hole defines two cutouts; the touching plate comprises two blocking blocks, and each of the two blocking blocks being extended from an edge of the locking hole on a bottom surface of the touching plate; a first end of the spring abuts the limiting portion, and a second end of the spring abuts a top surface of the touching plate; the bottom surface of the touching plate is opposite to the top surface of the touching plate; the first end of the spring is opposite to the second end of the spring; each of the two protrusions extends out of each of the two cutouts and abuts the bottom surface of the touching plate; and one of the two protrusions is located between the two blocking blocks thereby preventing the body from rotating in the locking hole. 2. The heat sink mounting device of claim 1, wherein the touching plate further defines a receiving hole communicating with the locking hole, the receiving hole and the locking hole are circular, and a diameter of the receiving hole is greater than a diameter of the locking hole; and the second end of the spring is received in the receiving hole. 3. The heat sink mounting device of claim 1, wherein the body comprises a locking portion, and the locking portion comprises a plurality of outer threads; the heat sink mounting device further comprises a circuit board, the circuit board defines a threaded hole, and the locking portion is engaged in the threaded hole. 4. The heat sink mounting device of claim 3, wherein a mounting post is located on the circuit board, and the threaded hole is defined in the mounting post. 5. The heat sink mounting device of claim 1, wherein the locking post further comprises a head portion connected to the body, a cross section of each of the limiting portion and the head portion is circular, and a diameter of the head portion is greater than a diameter of the limiting portion. 6. The heat sink mounting device of claim 1, wherein the two protrusions are symmetrical about a central axis of the body. 7. The heat sink mounting device of claim 1, wherein the two cutouts are symmetrical about a central axis of the locking hole. 8. The heat sink mounting device of claim 7, wherein the two blocking blocks are located in a side of one of the two cutouts. 9. A heat sink mounting device, comprising: a touching plate defining a locking hole; anda mounting member comprising a locking post; the locking post comprising a body and two protrusions protruding from the body;wherein an inner surface of the locking hole defines two cutouts; the touching plate comprises two blocking blocks, and each of the two blocking blocks being extended from an edge of the locking hole on a bottom surface of the touching plate; each of the two protrusions extends out of each of the two cutouts and abuts the bottom surface of the touching plate; and one of the two protrusions is located between the two blocking blocks thereby preventing the body from rotating in the locking hole. 10. The heat sink mounting device of claim 9, wherein the mounting member further comprise a spring, and the locking post further comprises a limiting portion located on the body; a first end of the spring abuts the limiting portion, and a second end of the spring abuts a top surface of the touching plate; the bottom surface of the touching plate is opposite to the top surface of the touching plate; and the first end of the spring is opposite to the second end of the spring. 11. The heat sink mounting device of claim 9, wherein the touching plate further defines a receiving hole communicating with the locking hole, the receiving hole and the locking hole are circular, and a diameter of the receiving hole is greater than a diameter of the locking hole; and the second end of the spring is received in the receiving hole. 12. The heat sink mounting device of claim 9, wherein the body comprises a locking portion, and the locking portion comprises a plurality of outer threads; the heat sink mounting device further comprises a circuit board, the circuit board defines a threaded hole, and the locking portion is engaged in the threaded hole. 13. The heat sink mounting device of claim 12, wherein a mounting post is located on the circuit board, and the threaded hole is defined in the mounting post. 14. The heat sink mounting device of claim 10, wherein the locking post further comprises a head portion connected to the body, a cross section of each of the limiting portion and the head portion is circular, and a diameter of the head portion is greater than a diameter of the limiting portion. 15. The heat sink mounting device of claim 9, wherein the two protrusions are symmetrical about a central axis of the body. 16. The heat sink mounting device of claim 9, wherein the two cutouts are symmetrical about a central axis of the locking hole. 17. The heat sink mounting device of claim 16, wherein the two blocking blocks are located in a side of one of the two cutouts.