A disposable injection syringe includes a barrel body and an extruded part combined with the barrel body. A protective cover is provided outside the first end of the barrel body used to combine with an injection needle. The protection cover includes a first part and a The first part is detachably combined with the first end of the barrel. The first part is used to cover an injection needle or the outside of a nozzle of the barrel. The protective cover further includes a peelable connection between the first and second parts. A removable part. After removing the removable part, it is allowed to remove the first part to expose the nozzle or injection needle, so the used syringe can easily judge from the appearance that it has been used, and further avoid the syringe being duplicated. use.一種拋棄式注射針筒，包括一個筒身以及與筒身結合的一個擠壓件，在筒身用來與一個注射針頭結合的第一端外設置一個保護蓋，保護蓋包括一個第一部分以及不可拆卸地與筒身的第一端結合的一個，第一部分用來包覆在一個注射針頭或筒身的一個接嘴外側，保護蓋進一步包括可剝離地連接在第一與第二部分之間的一個可移除部分，剝離可移除部分後允許取下第一部分使接嘴或注射針頭外露，如此使用過的注射針筒可以輕易地從外觀判斷已被使用過，進一步避免注射針筒被重複使用。
