The invention discloses a troweling device for building construction, which comprises a troweling plate, a motor, a switch, a storage battery and a handle. The four sides of the troweling plate are all provided with an upwardly tilted flange, and the flange is in the shape of an arc. Structural setting, the four flanges are connected end to end, the four flanges are arranged in a rectangular ring structure, a support rod is fixed vertically in the middle of the surface of the trowel, the handle is set above the trowel, and the motor is fixedly installed at the lower end of the handle. The rotating shaft of the motor is set vertically downward, the motor is provided with a cover body covering the motor, the upper end of the cover body is fixedly connected with the handle, the lower end of the cover body is provided with a through hole, the upper end of the support rod extends into the cover body along the through hole, and is connected with the The rotating shaft on the motor is fixedly connected. The invention is simple in structure, easy to use, can effectively rotate the plastering plate while pushing the plastering knife, increases the contact area with the concrete, and can smooth the concrete faster, greatly increasing the working efficiency and reducing the increased work intensity.