In order to study the performance of straw fiber reinforced foam concrete, fiber-reinforced foam concrete was prepared by physical foaming method using ordinary silicate cement as the main cementitious material, silica fume, metakaolin and fly ash were used as supplementary cementitious materials. The effects of straw fiber on the density, water absorption, compressive strength, flexural strength, splitting tensile strength and frost resistance of foam concrete were investigated by full factorial tests at different water-to-binder ratios and forming agent dosages. The results show that the density, compressive strength and splitting tensile strength of straw fiber reinforced foam concrete show a change law of increasing and then decreasing with the increase of fiber admixture for different water-to-binder ratios and forming agent dosages. Compressive strength increases with density as a power function. The splitting tensile strength increases exponentially with the increase of compressive strength. When the water-to-binder ratio is 0.45, the flexural strength increases first and then decreases with the increase of fiber content. When the water-to-binder ratio is 0.50, the flexural strength increases with the increase of fiber content. The incorporation of fiber increases the pore size and water absorption rate of foam concrete, and reduces its frost resistance.