Lake water organism monitoring sampler

The utility model discloses a lake water organism monitoring sampler which comprises a mounting rod, a sampling barrel fixedly connected to the lower end of the mounting rod, a water inlet formed in the bottom of the sampling barrel, scale marks arranged on the mounting rod, a suction mechanism mounted on the sampling barrel, and an opening and closing mechanism mounted on the sampling barrel and used for blocking the water inlet. The opening and closing mechanism comprises a first rotating shaft, an eccentric baffle, a first bevel gear, a second bevel gear, a cylindrical gear, a second rotating shaft and a vertical plate, the first rotating shaft is rotationally connected to the sampling barrel, the eccentric baffle is connected to the bottom of the first rotating shaft, and the first bevel gear is mounted at the top of the first rotating shaft; a second bevel gear rotationally matched with the first bevel gear is mounted on the upper side of the first bevel gear, the second bevel gear is mounted on a second