Steel sheet pile supporting structure for construction of main foundation pit of cable-stayed bridge

The utility model relates to a steel sheet pile supporting structure for cable-stayed bridge main foundation pit construction, and relates to the technical field of steel sheet piles, the steel sheet pile supporting structure comprises a steel sheet pile body, the steel sheet pile body comprises a rectangular plate-shaped baffle, and a cylindrical boss is fixed to one side edge of the baffle in the length direction; a concave table which is matched with the boss in an inserted mode and provided with a C-shaped section outline is fixed to the side edge, away from the boss, of the baffle in the length direction, the multiple steel sheet pile bodies are arranged, and the bosses of the adjacent steel sheet pile bodies are arranged in the concave table in an inserted mode. The bosses and the concave tables are fixed to the two ends of the baffles, the bosses are matched with the concave tables in an inserted mode, during use, the multiple steel sheet pile bodies are arranged, the bosses of the adjacent steel sheet