Dental universal threaded injection needle and dental syringe

The utility model relates to the technical field of medical instruments, in particular to a dental universal threaded type injection needle and a dental syringe, the dental universal threaded type injection needle is used for being installed on the dental syringe, and the dental universal threaded type injection needle comprises a needle seat used for fixing a needle tube. A mounting groove used for being in threaded connection with the dental syringe is formed in the needle base, an opening is formed in one side of the mounting groove, a plurality of different threaded structures are sequentially arranged on the inner wall of the mounting groove in the direction from the opening to the bottom of the mounting groove, the opening faces the direction of the bottom of the mounting groove, and the threaded structures are in threaded connection with the mounting groove. The inner diameters of the plurality of thread structures are sequentially reduced; due to the arrangement of a plurality of different thread stru