Drainage structure of building project foundation pit support

The utility model relates to the technical field of foundation pit drainage, and discloses a drainage structure of a building project foundation pit support, which comprises a water pump and a drainage mechanism, the drainage mechanism comprises a guide pipe fitting, a drainage pipe fitting and a filtering assembly; the filtering assembly comprises a connecting pipe, a first filtering piece and a second filtering piece; a cleaning assembly is installed on the drainage pipe fitting and comprises a supporting piece, a waterproof motor and a cleaning piece, a fixing block is arranged on the bottom end face of the supporting piece, through cooperation of a water pump, a drainage mechanism, a first filtering piece and a second filtering piece, water entering the drainage pipe fitting can be filtered, and the situation that the water pump is blocked by soil, sand and stones in a foundation pit is avoided; through the arrangement of a waterproof motor and a cleaning piece, the second filtering piece is rapidly clean