The invention discloses a valve rod plane semi-automatic lathe. The valve rod plane semi-automatic lathe comprises a frame, and a main shaft rotationally connected to the frame. The valve rod plane semi-automatic lathe further comprises a supply device, a feeding device and a turning device; the turning device comprises a slide rail fixed on the frame, a horizontal cutter base slidingly connectedto the slide rail, a chamfering turning cutter fixed on the horizontal cutter base, a drilling turning cutter, a grooving cutter slidingly connected to a mounting base of a main shaft through a vertical cutter base in a lifting mode, a cutter feeding mechanism arranged on the frame and used for driving the horizontal cutter base and the vertical cutter base to move, and a cutter unloading mechanism; the drilling turning cutter and the rotating axis of the main shaft are positioned on the same straight line; and the chamfering turning cutter is positioned on one side of the drilling turning cutter. In the lathe, rods can be automatically mounted on the main shaft; the chamfering, the drilling and the thread cutter treating groove formation can be performed on the rods at the same time; andafter multiple procedures are integrated on the same equipment, the valve rod machining flow can be reduced, the valve rod machining time is shortened, and the purpose of improving the valve rod production efficiency is improved.