Underwater multi-bottle water sampling device and sampling method thereof

The invention relates to the field of water quality detection, and particularly discloses an underwater multi-bottle water sampling device and a sampling method thereof. The device comprises a driving structure, a shunting structure and a sampling structure, the driving structure provides power for the shunting structure, and the shunting structure conveys a water sample to the sampling structure; the sampling structure comprises a plurality of sampling parts, the shunting structure is respectively connected with water inlets of the plurality of sampling parts, each sampling part comprises a piston and a sampling wall, the sampling wall is in a pipeline shape, the piston is movably arranged between the sampling walls, and a closed sampling cavity is formed among the piston, the sampling wall and the water inlets of the sampling parts. By arranging the multiple sampling parts, the effects of one-time water entering and multi-point sampling can be achieved, the problem of heavy buoyancy change before and after