In view of the complexity and diversity of Invar alloy mould plate shape, the low efficiency and low quality of traditional processing methods, on the basis of actual production and referring to the experience of ship hull plates forming process, the adaptability of the rotary square punch and non-pair stamping technology on Invar mould plate forming was studied. The material characteristics, shape characteristics and forming process of Invar alloy are analyzed, and it is indicated that the rotary square stamping punch combined with the large tonnage oil press can effectively form the Invar alloy mold plate, and the forming error is less than the production demand.