The utility model relates to a positioning and line marking device for an end socket hole, which belongs to the technical field of end socket processing and comprises an end socket fixing mechanism, a cantilever hole drawing mechanism and a worktable. The end socket fixing mechanism which is a three-claw centering mechanism is arranged on the worktable and is fixedly connected with the worktable. The cantilever hole drawing mechanism comprises a bracket, an end socket center positioning mechanism, a hole center positioning mechanism and a drawing pen holding mechanism which are movably connected in sequence. With simple structure, accurate positioning, good convenience, high speed, high safety and good reliability, the positioning and line marking device can effectively increase the working efficiency, lower the labor intensity and improve the product quality.