Deep well foundation pit dewatering device

The invention relates to the technical field of deep foundation pit dewatering equipment, and discloses a deep well foundation pit dewatering device which comprises a compensation box body, a water suction pipe communicated with a water inlet pipe, a sewage pump communicated with a water outlet pipe, two groups of sewage filtering boxes arranged in the compensation box body and an automatic cleaning assembly arranged between the sewage filtering boxes and the compensation box body. The automatic cleaning assembly comprises two sets of one-way lead screws rotationally connected to the two sides of the upper portion of an inner cavity of the sewage filtering box, a filtering plate in threaded connection with the two sets of one-way lead screws at the same time, gears rotationally connected to the two sides of the sewage filtering box through rotating shafts, and conical wheels fixedly arranged outside one sides of the one-way lead screws and outside one ends of the rotating shafts in a sleeving mode and engaged