Automatic rotary marking device

The utility model discloses an automatic rotary marking device which comprises a lens fixing module, a gear shaping small device, a positioning jig, a first pushing air cylinder, a workpiece, a driven rotary small device, an elastic pin small device and a driving rotary small device, and the gear shaping small device comprises a small device base arranged on one side of the lens fixing module. A lead screw cushion block A and a lead screw cushion block B are symmetrically arranged at the top end of the small device base, and lead screw supporting end fixing parts are arranged at the top end of the lead screw cushion block A and the top end of the lead screw cushion block B correspondingly. The beneficial effects are that a tooth end face needing to be marked can be accurately found by adopting an elastic pin and microswitch alignment mode, and the two modules are adopted to drive the lens to move so as to be compatible with various marking positions of various workpieces; the problem of inaccurate manual posi