Water draining, filtering and controlling device for goaf water in coal mine

The utility model is suitable for the technical field of mining, and provides a coal mine goaf water draining, filtering and controlling device which comprises a rectangular cylinder and a water pumping pipe fitting. The water pumping pipe fitting comprises an L-shaped water pumping pipe; one side of the L-shaped water pumping pipe is communicated with a rectangular frame; an anti-blocking piece is clamped on the inner wall of the rectangular frame; the anti-blocking piece comprises a clamping block; a water guide pipe is fixed on one side of the clamping block; the top in the water guide pipe communicates with a conical pipe; two guide columns are fixed at the bottom in the water guide pipe; a movable circular ring is in sliding fit between the two guide columns; a plurality of fan-shaped grooves are formed in the top of the movable ring; a U-shaped plate is fixed to the top of the movable ring. A buoyancy ball is arranged at the top of the U-shaped plate; two elastic springs are fixed between the movable ci