The present invention provides an injection syringe, which is mainly provided with a needle tube part, a convex body is provided at the bottom of the needle tube part, a compression part is provided above the needle tube part, and a positioning plate is provided between the needle tube part and the compression part, The positioning plate is provided with a perforation, the bottom of the positioning plate is provided with a fixed seat, a groove is provided in the fixed seat, the convex system of the needle tube portion corresponds to the groove of the fixed seat, and the bottom edge of the fixed seat is provided There are several guiding grooves connected to the groove, a positioning block is provided on the outer side wall surface of the positioning plate, a pressing portion is provided above the compression portion, the middle portion of the pressing portion is a puncture surface, and both sides of the pressing portion A buckling piece is extended, the bottom surface of the buckling piece is provided with a hook for interlocking with the positioning block of the positioning plate, a needle is fixed on the perforation of the positioning plate, and the bottom end of the needle It is connected to the groove of the fixing seat, the needle is located in the compression part, the needle tip of the needle is located below the puncture surface of the pressing part, so that the needle, the needle tube and the medicine are integrated, the needle can be hidden To prevent needle sticks Yu.本發明係在提供一種注射針筒，主要係設有一針管部，該針管部內之底部設有一凸體，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，該定位板之底部設有一固定座，該固定座內設有一凹槽，該針管部之凸體係與該固定座之凹槽相對應，該固定座之底緣設有數個連通於該凹槽之導引槽，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，一針頭係固設於該定位板之穿孔上，該針頭之底端係連通於該固定座之凹槽內，該針頭並位於該壓縮部內，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。
