The invention discloses a porous foam iron-nickel-chromium alloy material preparation method, which comprises: selecting a porous material, and at a room temperature, immersing in an aqueous polymer binder; uniformly spraying the surface of the porous material immersed in the aqueous polymer binder by using nanometer chromium powder; drying; separating the excess chromium powder from the porous material matrix; coating the chromium porous material by using an electric conduction glue in an impregnated manner; carrying out heating and curing treatment on the chromium porous material, and electrodepositing an iron-nickel alloy; carrying out redox treatment; and carrying out secondary chromium diffusion treatment to obtain the porous foam iron-nickel-chromium alloy material. According to the present invention, the preparation method is scientific, the selected process parameters are reasonable, the quality is easy to control, the cost is low, the product with characteristics of light weight, large specific surface area, high thickness of 5-100 mm, high porosity of 96-99.9%, excellent high-temperature resistance and excellent corrosion resistance, and capable of being used under harsh working conditions such as high temperature, corrosion and the like can be prepared, and the product is particularly adopted as the high temperature filtration material, the chemical industry catalysis material, the carrier material, the burner gas distribution material, the high temperature flame retardant material, and other materials.