The invention provides an air and water coupling pressure sandy soil permeability test device and method and belongs to the field of rock and soil mechanical experiments. It is difficult to preciselypredict the changes of internal rock and soil physical and mechanical properties, and popularization of on-site testing is limited by tedious laboratory determination procedures, a high requirement onan experimenter and the like. According to the air and water coupling pressure sandy soil permeability test device and method, a sample is placed in a sample bin, and the permeability coefficient ofthe sample is calculated and acquired by measuring the volume and temperature of liquid overflowing out of the sample bin. The test device is simple in structure and easy to assemble; and the requirement on a test environment is low, implementation is easy, the problem that it is difficult to determine sandy soil permeability on site is overcome, practicability is strong, and application and popularization are facilitated.