Movable floater on-off control type fixed-depth underground water sampler

The utility model discloses a movable floater on-off control type fixed-depth underground water sampler which comprises a sampling chamber, an opening and closing door, a gas collecting cover, a traction line, a floater, a hose and a feedback whistle, the opening and closing door is pivoted to a water inlet in the top end of the sampling chamber, and the opening and closing door is connected withone end of the traction line; the other end of the pull wire is connected with the floater, the gas collecting cover is detachably fixed to the top end of the sampling chamber and used for collectinggas discharged from the sampling chamber, the gas collecting cover is fixedly connected with one end of the hose and communicated with the hose, and the feedback whistle is installed at the other endof the hose. Compared with the prior art, external energy input is not needed in the whole process of the device, water sample collection at a fixed depth can be achieved, the automation degree is high, the controllable effect