Novel injection syringe

The invention relates to a novel injection syringe, and belongs to the related technical field of medical apparatuses and instruments. The novel injection syringe mainly comprises a syringe cap, a syringe needle, a cylinder body and a piston. The syringe cap comprises a cap body, the cap body is of a hollow cylinder structure, the top part of the cap body is of a closed structure, and the bottom part of the cap body is of an open structure; a first through groove is formed in the side part of the cap body; the inner wall of the cap body is fixedly connected with a cannula through a connecting plate; the top part of the cannula is of a closed structure, and the bottom part of the cannula is of an open structure; a second through groove is formed in the side part of the cannula; an arc baffle plate used for closing the first through groove is arranged between the cannula and the cap body, one side of the arc baffle plate is fixedly connected with a direct baffle plate, the other side of the arc baffle plate is