The invention discloses a soil resistance measuring device, and belongs to the technical field of intelligent agricultural equipment detection. According to the device, the advantages of an electroniccontrol technology and mechanical optimization design are combined, the characteristics of a PVDF piezoelectric film are utilized, and a spiral auger shaped compactness measuring device is designed;a spiral structure of the compactness measuring device is located in a groove IV of a shell; the PVDF piezoelectric film bears the force of the soil through gear transmission, so that the PVDF piezoelectric film is extruded, and generated electric signals are superposed to generate the electric signal due to the characteristics of a spiral auger; the electric signal is transmitted to an LCD colorscreen of a display device through a corresponding conversion circuit; and through the design, the good sealing performance of the measuring device is guaranteed, and the service life of the testing device is remarkably prolonged. The device solves the defects that dust is not prone to enter an existing testing device, and the existing testing device is large in component loss and the like; and the device is easy to operate, capable of effectively measuring the compactness of the soil, suitable for different types of soil and wide in application range.