The invention relates to a separate safety needle sleeve device.The needle sleeve body of the said device forms an opening on one side along the longitudinal axis, the opening width is reduced from the near end of the needle sleeve body to the turning part of the needle sleeve body, the needle sleeve body extends on the near side wall to form a first extension section respectively, and the end of the first extension section on both sides bulges to form a fixed part in the direction of the space.The needle fixing element is connected to the side wall of the needle sleeve body and is located in the containing space.The fixing plate with the through hole is connected to the bottom surface of the needle sleeve body through the second extension section, and can move relative to the needle sleeve body.And the connection between the second extension section and the fixing plate is corresponding to the position of the fixing part at the first extension section, so that when the fixing plate enters the space between the first extension section, the fixing part can fasten the bottom of the fixing plate.本創作係一種分離式安全針套裝置。前述裝置之針套本體沿縱向軸線於一側形成開口，開口寬度由針套本體近端減縮至針套本體之轉折部，針套本體於近端之邊牆更分別延伸形成第一延伸段，位於二側的第一延伸段之端部往容置空間方向凸起形成固定部。其針頭固定元件係連接於針套本體之邊牆且位於容置空間內。設有貫孔的固定板經由第二延伸段連接至針套本體之本體底面，並可相對於針套本體活動。而第二延伸段與固定板之連接處係對應固定部於第一延伸段之位置，以使固定板於進入第一延伸段之間的空間中時，得以讓固定部扣住固定板之底部。
