The invention relates to the technical field of sewing equipment, in particular to an automatic pocket creasing mechanism. In the prior art, pocket raw materials are generally placed on ironing equipment for ironing and shaping so as to perform the final sewing work procedure, special operation is needed, the pocket raw materials need to be kept for a certain time when shaped so as to achieve the effect of pocket shaping, therefore, the work efficiency of the work procedure is low. The automatic pocket creasing mechanism comprises a pre-shaping assembly and a side creasing shaping assembly, the pre-shaping assembly comprises a lower pocket creasing template, an upper pocket creasing template and an upper pocket creasing action assembly, and the side creasing shaping assembly comprises a left pocket creasing piece, a right pocket creasing piece and a front pocket creasing piece. The automatic pocket creasing mechanism can realize automatic operation, has easy operation, standard shaping and high work efficiency, and ensures the quality of products.