Multi-layer depth sampling device for environmental monitoring

The invention discloses an environment monitoring multi-layer depth sampling device which comprises a rectangular frame, a fixed block, a threaded connection block and a plurality of driven blocks are arranged in the rectangular frame, a round rod is rotatably connected to the inner wall of the rectangular frame, and a screw in threaded connection with the threaded connection block is fixed to the upper end of the round rod. A motor connected with the screw rod is installed on the rectangular frame, a first connecting rod is hinged to the fixed block, second connecting rods are coaxially hinged to the driven blocks, a third connecting rod is hinged to the threaded connecting block, and the first connecting rod, the second connecting rods and the third connecting rod are distributed in a continuous Z shape. The sewage sampling amount is increased when large-span multi-layer sewage is sampled, and the sewage sampling amount is reduced when small-span multi-layer sewage is sampled, so that mutual influence is av