Underwater detection plant sampling device

The invention discloses an underwater detection plant sampling device which comprises a base and a concave frame, at least one threaded hole is formed in the base, a stand column is arranged at the upper end of the base, a first motor is arranged in the stand column, a first shaft rod is arranged at the output end of the first motor, a rotating plate is fixedly connected to the upper end of the first shaft rod, and a second shaft rod is arranged at the lower end of the rotating plate. A first electric push rod is arranged on one side of the rotating plate, a first motor box is fixedly connected to the side, opposite to the rotating plate, of the first electric push rod, a third motor is arranged in the first motor box, a screw penetrating through the first motor box is arranged at the output end of the third motor, a lifting plate is in threaded connection with the screw, and a clamping block is arranged on one side of the lifting plate. A guide rod inserted into the clamping block is arranged at the lower en