Sampling device for municipal sewage treatment

The utility model discloses a sampling device for municipal sewage treatment. Comprising a connecting cylinder, at least three connecting ropes, a pull rope, a sampling bottle, a weight increasing object and a limiting unit, wherein the top of the connecting cylinder is open, and a plurality of water through grooves are formed in the side wall of the connecting cylinder; the pull rope is fixedly connected with the connecting ropes; a bottle opening of the sampling bottle is detachably screwed with a bottle cap; an opening of the connecting cylinder protrudes outwards to form an annular flange, the limiting unit comprises a limiting ring piece capable of being arranged on the outer side of a bottle opening of the sampling bottle in a sleeving mode and a clamping mechanism fixedly connected with the limiting ring piece and detachably clamped to the annular flange, and the inner diameter of the limiting ring piece is smaller than the outer diameter of a bottle body of the sampling bottle; the sampling bottle can