The invention discloses an automatic pipe sawing fixture. The automatic pipe sawing fixture comprises a fixture body. The fixture body comprises a pipe sawing worktable provided with a feed inlet. One clamping device is arranged on the upper surface of the pipe sawing worktable. Sliding guide rails are arranged on the two sides, facing the feed inlet, of the bottom of the pipe sawing worktable respectively. A feeding worktable is slidably connected to the sliding guide rails, and another clamping device is arranged on the upper surface of the feeding worktable. A first control chip and a second control chip which are connected with the corresponding clamping devices respectively are arranged in the pipe sawing worktable and the feeding worktable respectively. A third control chip controlling the feeding worktable to move on the sliding guide rails is further arranged in the feeding worktable. The clamping devices can be controlled by the first control chip, the second control chip and the third control chip to be automatically loosened or to automatically clamp a pipe after the pipe is cut one time, and the feeding worktable can be controlled to automatically conveying materials and return back. Labor intensity is reduced, working efficiency is improved, the phenomenon that the pipe falls because the fixture is loosened is avoided, product quality is guaranteed, cost is reduced, safety accidents caused by falling of the pipe are avoided, and safety is improved.