Foundation pit supporting structure and construction method thereof

The invention discloses a foundation pit supporting structure and a construction method thereof. The foundation pit supporting structure comprises a plurality of baffles arranged on the inner side wall of a foundation pit, wherein all the baffles are sequentially arranged in the circumferential direction of the foundation pit, and a plurality of connecting rods are connected between each baffle and the inner side wall of the foundation pit; a connecting hole penetrates the position, located on each connecting rod, of each baffle in the thickness direction of the baffle, a mounting hole is formed in the position, located on each connecting hole, of the foundation pit, and one end of each connecting rod is inserted into the corresponding mounting hole through the corresponding connecting hole; an abutting rod used for abutting against the inner side wall of each mounting hole is rotationally arranged at the end, located in the mounting hole, of the corresponding connecting rod, and a driving assembly used for d