Sampling depth-adjustable pond water sampling device

The invention discloses a sampling depth-adjustable pond water sampling device. The device comprises a floating plate structure, a rope and a water sampler, wherein a through hole penetrating the topsurface and the bottom surface of the floating plate structure is formed in the middle part of the floating plate structure; a rope fixing column is arranged on the top surface of the floating plate structure; a first winding column, a second winding column and a third winding column are arranged at a linear position between the rope fixing column and the through hole; the first winding column, the second winding column and the third winding column are sequentially arranged along the direction from the through hole to the rope fixing column; a scale is arranged on the rope; the rope passes through the through hole of the floating plate structure; one end of the rope is fixedly connected with the rope fixing column; the other end of the rope is fixedly connected with the water sampler; andthe buoyancy of the floati