The utility model discloses a heat dissipation sheet copper mounting bracket with the mistakenly-mounting prevention function. The mounting bracket comprises a square plate (1), a V-shaped mounting support leg (2) and a linear mounting support leg (3), wherein the middle part of the V-shaped mounting support leg is riveted to the back surface of a first mounting platform (1a) of the square plate through two rivet joints arranged left and right at an interval; the upper end of the linear mounting support leg is riveted to the back surface of the square plate; a bracket mounting hole (A) is formed in each of the two end heads of the V-shaped mounting support leg and the lower end of the linear mounting support leg; a copper sheet welding zone (E), a sheet copper welding assistant scribed line (F) and a border scribed line (B) are arranged in the middle of the front surface of the square plate; a heat transfer pipe welding assistant scribed line (C) is arranged in the middle of the back surface of the square plate; different mistakenly-mounting prevention numbers (D) are respectively formed in the positions close to three bracket mounting holes. The mounting bracket has the characteristics of simple structure, convenience for mounting, compactness, low manufacturing cost and the like, and has the mistakenly-mounting prevention function.