This creation is to provide an injection syringe, which is mainly provided with a needle tube portion, a compression portion is provided above the needle tube portion, a positioning plate is provided between the needle tube portion and the compression portion, a positioning plate is provided with a perforation, the positioning Positioning blocks are provided on the outer side wall surface of the board. A pressing part is provided above the compression part. The middle part of the pressing part is set as a puncture surface. A retaining piece is extended on both sides of the pressing part, and the bottom surface of the retaining piece is provided. There is a hook for interlocking with the positioning block of the positioning plate. The bottom of the needle tube part is provided with a fixing seat. The bottom of the fixing seat is provided with a plurality of communicating guide grooves. A needle is fixedly set on the fixing. On the seat, the needle is penetrated into the compression part by the perforation of the positioning plate, and the needle tip of the needle is located below the puncture surface of the pressing part. In this way, the needle, the needle tube and the medicine are set as an integrated type, and the needle can be hidden To prevent the danger of being stuck.本創作係在提供一種注射針筒，主要係設有一針管部，該針管部上方設有一壓縮部，該針管部與該壓縮部之間設有一定位板，該定位板上設有一穿孔，該定位板之外側壁面上設有定位卡塊，該壓縮部上方設有一按壓部，該按壓部中間部位設為穿刺面，該按壓部之兩側延伸設有一扣持片，該扣持片之底面設有供與該定位板之該定位卡塊相互卡設之卡勾，該針管部內之底部設有一固定座，該固定座底部設有數個相連通之導引槽，一針頭係固設於該固定座上，該針頭並由該定位板之穿孔穿伸入該壓縮部內，該針頭之針尖並位於該按壓部之穿刺面下方，如此，將針頭、針管及藥劑設為一體式，可將針頭隱藏，防止被針扎之虞。
