Anti-floating precipitation device for deep foundation pit

The utility model relates to the field of deep foundation pit dewatering, in particular to a deep foundation pit anti-floating dewatering device. The deep foundation pit anti-floating dewatering device comprises a hard pipe, a hole dredging assembly and a smashing assembly, the hole dredging assembly is located in the hard pipe and comprises a waterproof ring, limiting grooves, springs and extrusion balls, the waterproof ring fixedly connected is installed at one end in the hard pipe, and the multiple limiting grooves are formed in the inner wall of the waterproof ring; and fixedly-connected springs are installed in the limiting grooves correspondingly, fixedly-connected extrusion balls are installed at the other ends of the springs correspondingly, and a protective cover in sliding connection is installed in the waterproof ring. According to the anti-floating dewatering device for the deep foundation pit, the extrusion balls are matched with the springs, mud blocks in the filtering holes are dredged, and the