Small-sized hydro-optical needle

The invention discloses a small hydro-optical needle. Comprising a shell, a needle tube arranged on the shell, a piston arranged in the needle tube, a needle frame connected with the needle tube, a negative pressure cavity formed in the needle frame and at least one needle head arranged in the negative pressure cavity and communicated with the needle tube. The negative pressure mechanism is used for providing a negative pressure environment for the negative pressure cavity; and the injection driving mechanism is used for driving the piston to reciprocate in the needle tube. The small-sized hydro-optical needle provided by the invention has the characteristics of compact structure, reasonable layout, small size and portability, is simple in structure and convenient to operate, can prevent injection liquid from leaking in the injection process, and has a good application prospect. 本发明公开了一种小型水光针，包括外壳、设置在所述外壳上的针管、设置在所述针管内的活塞、与所述针管连接的针架、形成于所述针架内的负压腔、设置在所述负压腔内且与所述针管连通的至少一个针头、用于为所述负压腔提供负压环境的负压机构以及用于驱动所述活塞在所述针管内进行往复运