Basement exterior wall unilateral formwork system and construction method thereof

The invention discloses a basement exterior wall unilateral formwork system and a construction method thereof. The system comprises a first supporting frame and/or a second supporting frame. The firstsupporting frame is used for being connected with a basement exterior wall template in an abutting manner, and the second supporting frame is used for being connected with an adjacent basement exterior wall template in an abutting manner. The first supporting frame comprises a frame body and a corner pre-burying device. The frame body is of a triangular structure, the horizontal right-angle sideof the frame body is arranged on a foundation, and the vertical right-angle side of the frame body is connected with the corresponding basement exterior wall template in an abutting manner. The cornerpre-burying device is arranged on the right-angle portion of the frame body so as to offset acting force generated to the frame body in the concrete forming process. The second supporting frame is set up by steel pipes, and an