The invention relates to a locking plate forming mould. The thickness of a locking plate is 1.5mm; the locking plate comprises a strip-shaped body part; an arc-shaped part extending to two sides is arranged in the middle of the body part; the length-width ratio of the locking plate is larger than 10; and the locking plate forming mould comprises a lower mould assembly formed by a lower mould plate, a lower base plate and a female die connected sequentially and fixedly, and an upper mould assembly formed by an upper mould plate, an upper base plate, an installation plate and a stripper plate connected sequentially. According to the locking plate forming mould provided by the invention, the stability in processing special-shaped parts is improved, the convenience in operation is realized, the process of routine maintenance and spare part replacement is simplified, and the production efficiency is greatly improved.