The invention discloses a molding mold of an injection molding hollow tube. The molding mold comprises an upper clamping mold and a lower clamping mold. An upper molding groove is arranged in the upper clamping mold. A lower molding groove is arranged in the lower clamping mold. A blowing structure and a camber limiting structure are further arranged between the upper clamping mold and the lower clamping mold. The molding mold is characterized in that a movable camber limiting structure is further arranged on the upper edge of the bent position of the lower molding groove of the lower clamping mold. The movable camber limiting structure and the camber limiting structure are further arranged on the upper edge of the bent position of the lower molding groove of the lower clamping mold, so that the overall quality standard and installation matching of the bent position of an injection molding piece are ensured. Meanwhile, the mold is simple in structure, convenient to implement and quite convenient to apply, and the mold injection quality standard is further ensured when the molding mold is used in cooperation with the camber limiting structure.