Soil fertility detection device

The soil fertility detection device comprises a bottom plate, a bearing box and a lifting mechanism, the bearing box is installed at the top of the bottom plate, the lifting mechanism is installed at the top of a fixed rotating disc, a movable block is connected to the outer side of a threaded rod in a sleeved mode, and a bearing plate is installed on the front face of the movable block; a sliding rail base is installed on the top of the bottom plate, and a fixing block is installed on the back face of the bottom plate. The lifting mechanism is mounted at the top of the fixed turntable, the motor II runs to drive the threaded rod to rotate, and the threaded rod rotates to enable the moving block to stably move on the inner side of the moving groove so as to adjust the position of the bearing plate in the vertical direction; the spiral blade is in contact with the soil, so that the sampling barrel goes deep into the lower part of the soil to sample the soil, the labor intensity of a user is reduced, the soil i