Water quality sampling device

The utility model discloses a water quality sampling device which comprises a supporting column, a lifting assembly is arranged in the supporting column, one side of the supporting column is connected with a mounting column in a sliding mode, one side of the mounting column is fixedly connected with a connecting box, a sampling barrel is arranged at the bottom of the connecting box, and the outer side of the sampling barrel is fixedly connected with a fixing ring. When the sampling barrel needs to sample in a river, a rope can pull a piston to move, so that water is sucked into the sampling barrel, when the rope moves, a rotating shaft can be driven to rotate, the rotating shaft can drive a mounting plate to rotate, when the mounting plate rotates, a movable frame can be driven to move left and right, so that a scraping plate is driven to move left and right, and when the sampling barrel pumps water, the scraping plate can move left and right; a lifting assembly is arranged, when sampling is needed, only a th