The light and high strength CF/ABS composites were designed and composite wrenches with various shapes were fabricated by using 3D printing technology. The self-made sizing agent for carbon fibers effectively improved the aggregation and surface wettability of carbon fibers, and has good bonding with the high flow ABS resin. The prepared 3D printing wrench could choose the size, caliber and thickness according to the actual needs, which technical has a practical application prospect. The quality and market price of 3D printing CF/ABS composite wrench were analyzed and the price of the wrench prepared by this method is about 0.6 yuan. The low price and high performance are conducive to the daily promotion of 3D printing CF/ABS composite wrench.