The invention discloses a method for improving a positioning stop block in the forming process of a composite material glue joint assembly, and belongs to the technical field of composite materials. According to the technical scheme, grooves are formed in the side face, making contact with a bowl-shaped piece, of a cylinder bowl-shaped piece through redesign of the appearance of the positioning stop block, and thus gaps are reserved between the bowl-shaped piece and the positioning stop block. The method has the advantages that the appearance design of the positioning stop block is changed in structure, so that the gaps are reserved between the positioning stop block of the composite material bowl-shaped piece and the bowl-shaped piece; after the composite material glue joint assembly is cured and molded, mold opening can be achieved through the gaps between the positioning stop block of the composite material bowl-shaped piece and the bowl-shaped piece, mold opening difficulty of the composite material glue joint assembly is greatly lowered, product quality is guaranteed, and timely delivery of products can be ensured.