Printing positioning jig of lens shell and scale transfer printing machine

The utility model provides a lens shell printing positioning jig and a scale transfer printing machine, which comprise a base body with a table-shaped structure, and the base body comprises a mounting column and a boss which are connected in parallel. The mounting column is of a cylindrical structure, a positioning hole is formed in the middle axis area of the mounting column in a penetrating mode, and the mounting column is connected with external transfer printing equipment through the positioning hole; the width of the boss is gradually reduced in the direction away from the mounting column, and the side face of the end of the boss is an arc face. The external to-be-transferred lens shell can be sleeved on the base body, and the inner surface of the external to-be-transferred lens shell is matched with the side surface and the top surface of the base body. The printing positioning jig provided by the utility model can meet the requirement of 360-degree rotary printing orientation, so that the printing cost