Using the raw soil and Portland cement， polycarboxylic series of water reducing agent and biological based foaming agent， the raw soil foam concrete with different density levels were prepared by pre-foam and mixed. The properties such as compressive strength， thermal conductivity， water absorption ratio and pore structure of raw soil foam concrete were investigated. The results show that when the cement content is 128.4-583.4 kg/m³， the raw soil content is 64.2-291.7 kg/m³， the water reducing agent content is 0.6-3.0 kg/m³ and the foam content is 6.1%-26.4% of solid material mass， the corresponding density grade of the raw soil foam concrete is 300-1 200 kg/m³， the compressive strength is 0.8-10.3 MPa， the thermal conductivity is 0.08-0.27 W/（m·K）， and the water absorption ratio is 6.5%-67.7%. The raw soil foam concrete meets the relevant performance requirement for foam concrete.