The foamed concrete (FC) was produced by using the main materials including Portland cement and foaming agent of animal protein. The effects of water-cement ratio, dry density, fiber lengths and fiber types on strengths, complete stress-strain curves under uniaxial compression, distributions of pore size and water absorption capability were investigated. Test results indicate that the compressive strength decreases exponentially with increasing porosity for both FC and fiber-reinforced foamed concrete (FRFC). The compressive strength has its different changing patterns with water-cement ratio for different fiber contents and porosities. In addition, the compressive and tensile strengths can be apparently raised by shorter fiber filament and change variously with different fiber contents. A greater improvement of compressive and tensile strengths is obtained by adding fiber meshes compared with fiber filaments under the same conditions. Three segments are discovered in the complete stress-strain curve, which include ascend, decend and fluctuant processes. The peak strain of FRFC reduces, however, the modulus of elasticity and residual strength of FRFC increases. For FRFC, the percentage of pore with larger radius decreases with increasing fiber content. Thus, the water absorption capability can be enhanced by fiber.