Deep foundation pit drainage structure

The utility model discloses a deep foundation pit drainage structure, relates to the technical field of foundation pit drainage, solves the problem that the drainage effect of a device is affected due to the fact that silt is prone to being accumulated above a steel plate net well lid and a pebble bed, and comprises a foundation pit, a water collecting ditch, a grit chamber and a water collecting well. The spiral conveyor communicates with a water collecting ditch through a connecting pipe, a water outlet is formed in the top end of the outer side wall of the connecting pipe, a submersible pump is arranged in the water collecting well, drainage ditches are formed in the periphery of the upper surface of the foundation pit, and a drainage pipe is arranged at the output end of the submersible pump. The end, away from the submersible pump, of the drainage pipe is located in the drainage ditch. Through the arrangement of the foundation pit, the water collecting ditch, the grit chamber, the water collecting well,