Drainage structure of building project foundation pit support

The utility model relates to the technical field of house building projects, and discloses a drainage structure of a house building project foundation pit support, which comprises a foundation pit slope surface, a drainage hole is arranged in the foundation pit slope surface, an insertion pipe is inserted in the drainage hole, a water outlet pipe is in threaded connection with the right side in the insertion pipe, and a sleeve is arranged on the right side of the outer surface of the insertion pipe. The insertion pipe and the water outlet pipe of the drainage structure can be taken out from the slope surface of a foundation pit together, so that the insertion pipe and the water outlet pipe can be reused conveniently, resources are saved, a baffle can block the right end of a sleeve and the right end of the water outlet pipe during sprinkling irrigation of concrete, and the water outlet pipe is prevented from being blocked by the baffle. And the baffle can rotate to a certain degree through a rotating shaft an