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This utility model relates to the field of steel formwork installation technology and discloses a steel formwork positioning structure. The steel formwork has positioning components installed on all four sides, and fixing holes are provided on all four sides. Positioning pins are installed on one side in both the horizontal and vertical directions, and positioning holes are provided on the corresponding positions on the other side. Adjustment holes are provided next to the positioning holes in the vertical direction. This steel formwork positioning structure, through the design of concave-convex fits on the left and right sides and rotatable positioning pins, achieves rapid alignment and initial locking of the steel formwork in the left and right directions. The concave and convex designs form a natural guide channel, eliminating the need for precise manual calibration during assembly. The convex side can naturally slide in along the mating surface of the concave side, significantly reducing the difficulty of positioning alignment. Furthermore, after the pin passes through the positioning hole, the head is rotated to be arranged laterally, utilizing the characteristic that the head length is greater than the width of the positioning hole to lock into the hole, effectively preventing the formwork from shifting before subsequent pin fixing.