The invention provides an injection syringe, which is mainly provided with a needle tube part, a compression part is arranged above the needle tube part, a positioning plate is arranged between the needle tube part and the compression part, and a perforation is arranged on the positioning plate, the positioning A positioning block is provided on the outer side wall surface of the board, a pressing part is provided above the compression part, a middle part of the pressing part is set as a puncture surface, a clamping piece is extended on both sides of the pressing part, and the bottom surface of the clamping piece is provided There is a hook for interlocking with the positioning block of the positioning plate, a bottom of the needle tube is provided with a fixed seat, the bottom of the fixed seat is provided with a plurality of communicating guide grooves, and a needle is fixed on the fixed On the seat, the needle penetrates into the compression part through 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 integrated, and the needle can be hidden To prevent the risk of being stuck by a needle.本發明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。
