The present invention relates to a cover for a pen-type syringe, wherein, when a hub mounted with the previously used needle of the syringe is inserted into a herb insertion hole of an upper end of an external side of a cover, the needle is bent by an insertion pressure and a needle press surface, and the syringe and the hub are separated from each other in a screw loosing manner through rotation and when the syringe is inserted into an opening portion of the lower part of the cover and pushed in a syringe insertion direction, the hub mounted with the needle inserted and bent inside the hub insertion hole is discharged out of the cover. The present invention is directed to a cover for a pen-type syringe, in which cover inner penetration holes are provided in the upper end of the cover, and, by an inner wall separation protrusion formed on an inner wall of the cover, the cover inner penetration holes are divided into a hub insertion hole for inserting a hub, which is the cover inner penetration hole positioned above the inner wall separation protrusion, and a cover lower penetration hole for inserting the syringe, which is the cover inner penetration hole positioned below the inner wall separation protrusion. Here, a movable body is inserted into the cover inner penetration hole. The movable body comprises a movable body lower body part configuring a circular plate shape and a movable body upper body part positioned at the center of the movable body lower body part and configuring a circular plate shape with a smaller area than the movable body lower body part. The movable body upper body part can move the movable body passing penetration hole above and below by the inner wall separation protrusion.COPYRIGHT KIPO 2016본 발명은, 덮개의 외측 상단의 허브삽입공 내부에, 주사기의 기 사용된 니들을 장착된 허브를 삽입하면, 삽입 압력과 니들 압착면에 의하여 니들이 구부려지게 되며, 나사 풀림 방식으로 주사기와 허브를 회전시켜 분리하고, 주사기를 덮개의 하부 개구부에 삽입하여 주사기 삽입방향으로 밀면, 허브삽입공 내부에 삽입되었던 구부려진 니들이 장착된 허브가, 덮개 밖으로 배출되도록 이루어진, 펜 타입 주사기의 덮개에 관한 것이다.본 발명은, 덮개의 상단에 덮개 내부