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A water-based foam fire extinguisher excellent in foaming properties and film-forming properties in a low temperature region which includes an aqueous solution of at least one member selected among potassium hydrogen carbonate, ammonium phosphate, ammonium sulfate, ammonium bromide, boron oxide, and

A water-based foam fire extinguisher excellent in foaming properties and film-forming properties in a low temperature region which includes an aqueous solution of at least one member selected among potassium hydrogen carbonate, ammonium phosphate, ammonium sulfate, ammonium bromide, boron oxide, and potassium tetraborate and, incorporated in the solution, a freezing point depressant so as to have a freezing point of -20.degree. C. or below, characterized by containing a perfluoroalkylbetaine as a fluorochemical surfactant and one or more amide-amino acid type surfactants represented by general formula (1) and/or (2) [EQU1](wherein R1 represents C7-23 alkyl, hydroxyalkyl, aralkyl, or alkenyl; and X represents an alkali metal or hydrogen) as hydrocarbon surfactants.

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1. An aqueous fire foam which has a solidifying point of -20.degree. C. or below by adding a solidifying point lowering agent to a solution containing at least one of:potassium hydrogen carbonate; ammonium phosphate; ammonium sulfate; ammonium bromide; boron oxide; and potassium tetraborate; wherein

1. An aqueous fire foam which has a solidifying point of -20.degree. C. or below by adding a solidifying point lowering agent to a solution containing at least one of:potassium hydrogen carbonate; ammonium phosphate; ammonium sulfate; ammonium bromide; boron oxide; and potassium tetraborate; wherein said aqueous fire foam, which has excellent foaming power and film-forming properties in a low temperature range, contains:perfluoroalkyl betaine as a fluorinated surfactant; an amide amino acid surfactant expressed by general formulas (1) and/or (2) shown below as a hydrocarbon surfactant wherein in said formulas: R1 is an alkyl group having 7 to 23 carbons, a hydroxy alkyl group, an aralkyl group, or an alkenyl group; and X is an alkali metal or hydrogen atom [EQU3]