The invention relates to a soil permeability detection device. The soil permeability detection device is characterized by comprising a calorstat, an air cylinder and a soil sample holder, wherein the air cylinder and the soil sample holder are arranged in the calorstat. The soil permeability detection device can be connected with a computer for data acquisition and computational analysis. The soil permeability detection device has the advantages that the soil permeability detection device can be connected with a computer system, the calorstat is used for simulating the temperature of soil under natural conditions, and the soil sample holder is good in sealing performance and provides precise measurement and control data for a whole soil permeability meter to make measurement results more precise; databases, report forms and curve graphs can be formed without a great quantity of complex testing processes and being attended so as to be applied flexibly.