Reverse trimming mechanism for fender

The utility model discloses a fender reverse edge trimming mechanism which comprises an upper die base, an inner guide wear-resisting plate is fixedly arranged at the inner end of the upper die base, an upper die pressing plate is fixedly arranged at the outer end of the inner guide wear-resisting plate, a die cavity is formed through mutual matching of the upper die base and a lower die base, and a die can be conveniently guided to move towards the inner side through the inner guide wear-resisting plate. The upper die pressing plate is used for pressing and fixing the die, the upper die spring is used for conveniently driving the upper die pressing plate to move up and down to movably press the die, and the upper die pressing plate moves up and down in the upper die base die cavity through the inner guide wear-resisting plate and the upper die spring, so that the die can be driven to move in the die cavity. When the upper die pressing plate is pre-pressed to the lower die base, the driving block starts to ma