Drainage device for building construction

The utility model discloses a drainage device for building construction, which comprises a water pumping main body, a water pumping pipe fixedly connected to the front of the water pumping main body, a drainage pipe fixedly connected to one side of the water pumping main body, a driving mechanism fixedly connected to the back of the water pumping main body, and a drainage frame fixedly connected to the bottom of the water pumping main body. The top of the drainage frame is fixedly connected with a pipe placing frame and a pipe collecting frame, the back face of the pipe placing frame and the back face of the pipe collecting frame are fixedly connected with rotating motors, the driving ends of the rotating motors are fixedly connected with pipe collecting discs, the outer sides of the pipe collecting discs are movably connected with standby water pipes, and the outer sides of the pipe collecting frames are fixedly connected with push handles. By means of the pipe placing frame, the pipe collecting frame, the r