Fixed-layer water quality sampling well

The utility model discloses a fixed-layer water quality sampling well, and belongs to the technical field of environmental restoration. Comprising a bottom pipe, a water filtering pipe, a top pipe and a well lid from bottom to top in sequence. The filler outside the pipe is sequentially provided with a lower end filter material filling section and an upper end bentonite sealing section from bottom to top; the lower end filter material filling section is a filter section which is arranged between the well casing and the wall of the drill hole and allows underground water to flow into the well casing; and the upper end bentonite sealing section is a water-proof and gas-proof material filling section between the well casing and the hole wall of the drill hole. According to the utility model, the structure of'plugging the upper end and the lower end and filtering water at the target end 'is adopted for divergent design, the water filtering pipe arrangement area of the well body is the area needing fixed-layer wat