A disposable injection syringe includes a barrel body and an extruded part combined with the barrel body. The barrel body includes a lug providing two finger buckle pools, and a removable portion is integrally extended on the lug and is removable. The removing part includes a buckle part, and the pressing part includes a pushing part for pressing by a finger. The pushing part is provided with a coupling hole corresponding to the buckling part of the removable part, and the squeeze part is inseparable from the removable part through the coupling hole. In combination, when using an injection syringe, use a knife (such as a diagonal cutter, a knife, a scissors) to destroy the removable piece, and separate the removable piece from the lug and the pushing part, so the used syringe can be easily used. Judging from its appearance, it has been used to further prevent the syringe from being reused.一種一次性注射針筒，包括一個筒身以及與筒身結合的一個擠壓件，筒身包括提供兩根手指扣池的一個凸耳，凸耳上一體地延伸一個可移除部，可移除部包括一個扣部，擠壓件包括提供一根手指按壓的一個推動部，推動部對應可移除部的扣部設置一個結合孔，擠壓件透過結合孔與可移除部不可分離地結合，當要使用注射針筒時要使用刀具（例如斜口剪、刀子、剪刀）破壞可移除件，使可移除件與凸耳及推動部分離，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。
