Gravel-cobble sampler

The utility model discloses a gravel-cobble sampler which comprises a motor, the output end of the motor is connected with a sampling structure, the sampling structure comprises a first spiral blade, a cylinder, a bent plate and a vertical pipe, the top of the first spiral blade is connected with the output end of the motor in a welded mode, and the outer wall of the first spiral blade is movably connected with the inner wall of the cylinder. The lower portion of the outer wall of the cylinder is fixedly connected with the inner side of a bent plate, and the inner wall of the bent plate is connected with the lower portion of the outer wall of the vertical pipe in a welded mode. At the moment, the second spiral blade located below the water level conveys the sample upwards, so that the sample enters the cylinder, then is conveyed upwards through the first spiral blade and finally is sent out from the top of the cylinder, water source isolation is achieved, sample washing is avoided, the sample state is guarant