Subcutaneous tunnel puncture needle

The utility model discloses a subcutaneous tunnel puncture needle, and relates to the technical field of medical instruments. The subcutaneous tunnel puncture needle comprises a puncture needle body, a mounting groove is formed in the top of the puncture needle body, an infusion tube is slidably embedded in the mounting groove, baffles are movably hinged to the left side and the right side of the bottom end of the infusion tube through hinge shafts, and a reset spring is fixedly connected between the two baffles. According to the subcutaneous tunnel puncture needle, the needle head of the puncture needle is aligned with the skin and punctures into the skin according to the subcutaneous diving distance of an affected part of a patient, the needle head is in a triangular pyramid shape and can be guided through the puncture needle according to the subcutaneous diving distance, the fixing groove is a blunt thread, and a blunt tip is convenient to sleeve into a lumbar cistern drainage tube; meanwhile, the threaded