The invention relates to a small dimension FPC bending mechanism which comprises an electric control box body, a carrier device, a positioning device, a round pin device, a roller device and a pressing device, wherein the carrier device is fixedly arranged at one end of the upper surface of the electric control box body; the positioning device is arranged on two adjacent edge of the carrier device; the round pin device and the roller device are arranged in parallel on one side of the carrier device, and the pressing device is arranged at the other end of the upper surface of the electric control box body and is located above the round pin device and the roller device; the carrier device is used for placing a product, the roller device is used for bending the product, the round pin device is used for moving to two ends of the FPC to form a bending reference, the roller device is used for bending the FPC around the round pin device, and the pressing device is used for pressing and attaching the FPC to the surface of a screen. The mechanism provided by the invention achieves automatic processing of FPC, so that the bending precision and the production precision are improved greatly, the human resources are reduced, and the production cost is lowered greatly.