The utility model provides a device for reducing liquid leakage of a needle head of a hydro-optical
syringe, which relates to the field of medical cosmetology and comprises a needle sleeve, a connecting tube is mounted at the bottom of the needle sleeve, a sealing
gasket is arranged at the top of the needle sleeve, an inner container is arranged on the inner bottom wall of the needle sleeve, a plurality of needle tubes are mounted at the top of the inner container, and a sealing
gasket is arranged at the bottom of the needle sleeve. A sealing ring plate is mounted on the inner wall of the needle sleeve, and a plurality of needle seats are mounted at the top of the sealing ring plate; the sealing
gasket is arranged to tightly suck the
skin of the face of a patient, no gap exists between the needle sleeve and the
skin of the face, and therefore the needle head of the hydro-optical
syringe is good in sealing effect, the liquid leakage phenomenon is reduced, the needle head, the cavity, the valve sleeve, the valve element, the spring, the groove, the first through hole and the second through hole are arranged, hydro-optical liquid flows in a one-way mode, and the sealing effect is good. And the needle head is provided with eight stress surfaces and points, so that the puncture pain is greatly reduced, the needle head is attached to the
skin, and the leakage of water, light and liquid is avoided.