The invention is a safety injection needle device.Including syringe,The front end of the syringe is provided with a syringe connector；A needle device,Including a needle seat,The needle seat is sleeved on the needle barrel connector.The front end of the needle seat is provided with a needle；An elastic actuator main part,The utility model comprises a fixed bracket with a vertical arm.A movable support with a horizontal arm,A soft hinge part,Two V-shaped elastomers and an intermediate kit,The arms of the two supports are connected by soft hinge.And through the two V-shaped elastomers connected on both sides of the support arm,Provide sufficient elastic force when the two supports are bent.The fixed bracket is connected to the intermediate kit.And the elastic actuator body is connected to the needle seat by the intermediate kit；A protective cover,The protective sleeve has a set space.The front end of the protective sleeve is provided with a plug-in part.The plug-in unit is connected to the plug-in unit extending upward at the end of the movable U-shaped unit.The movable U-shaped part is connected with the protective sleeve.本創作是一種安全注射針裝置，包括針筒，該針筒前端設有一針筒接頭；一針頭裝置，包括一針頭座，該針頭座套接於該針筒接頭，該針頭座前端設有一針頭；一彈性作動主體部，包括一設有垂直支臂的固定支架、一設有水平支臂的活動支架、一軟質絞鏈部、二V形彈性體及一中介套件，兩支架之支臂間是以軟質絞鏈部連接，並藉支臂兩側所連接的二V形彈性體，於該兩支架進行彎折操作時提供充分足夠的彈性作用力，該固定支架連結於該中介套件，而該彈性作動主體部以該中介套件連結於針頭座上；一保護套，該保護套具有一套置空間，該保護套的前端邊設有一插接部，該插接部組接於該活動U形部末端向上延伸的受插部，使該活動U形部與保護套相連結。
