Ploughing soil sampling device

The utility model relates to the technical field of soil detection, and discloses a cultivated land soil sampling device which comprises a supporting device, the supporting device comprises a support, the two ends of the support are fixedly connected with fixing blocks, and the middle of each fixing block is rotationally connected with a two-way screw rod. According to the cultivated land soil sampling device, the support is placed on cultivated land, the fork feet are inserted into the cultivated land, the gradienter I is observed, the horizontal angle is adjusted, the motor I is started, the motor I drives the bidirectional screw rod to rotate, the bidirectional screw rod drives the sliding block to move towards the center side, the sliding block drives the upper ends of the fork feet to move towards the center side, and the fork feet rotate around the support; a second gradienter is observed, a second motor is started, and the second motor drives the frame to rotate, so that the horizontal angle of the fra