A protective device includes a cover body, a tongue piece, a combined structure, a uniform moving structure and a buckle structure.The combined structure makes the back end of the cover body connected with the tail of the tongue piece.The tongue piece has a flexible part, which makes the head of the tongue piece move back and forth in an open position and a closed position.In the closed position, a butterfly needle retreats into the tongue piece, and both of them are put into the cover body at the same time, so as to prevent the tongue piece from leaving the cover body with the clasp structure.In this way, the needle head of the butterfly needle is protected by the cover body and tongue piece, which can maintain the safety of the medical waste recycler, and has the effect of labor-saving and automatic.一種保護裝置，包括一蓋體、一舌片、一結合構造、一致動結構與一卡扣結構。該結合構造讓蓋體後端與舌片尾部聯結在一起。該舌片有一可撓部，使舌片頭部在一張開位置與一閉合位置往復運動。在閉合位置時，一蝴蝶針具退入舌片，二者同時置入蓋體內，以卡扣結構阻止舌片離開蓋體。如此，該蝴蝶針具的針頭被蓋體與舌片保護，維護醫療廢棄物回收者的安全，兼具省力與自動等效果。
