The invention relates to a needle detection and warning device, which comprises a clamping member, a light detector, a controller and a warning device.The clamping member is clamped on the outside of the neck of the drip bottle； the photodetector has a light transmitting end and a light receiving end； the controller drives the light transmitting end to transmit and detect light and receive it from the light receiving end, and then transmits it to the controller to determine the light decay rate of the detected light.The controller determines that if the light decay rate of the droplets in the neck exceeds the set value, it means there is liquid in the neck of the drip bottle, if it does not exceed the set value, it means there is no liquid in the neck of the drip bottle, and sends a control signal to the warning device to drive the warning device to send a warning signal.Thus, the needle detection and warning device of the invention can inform the medical staff before the drip in the neck of the dropper bottle is emptied, and the drop bottle can be disassembled and replaced, which can effectively save the time for the medical staff to check back and forth.本發明關於一種針筒偵測警示裝置包括夾持構件、光偵測器、控制器及警示器。夾持構件夾設於點滴瓶頸部的外側；該光偵測器具有光發射端及光接收端；控制器驅動光發射端發射偵測光並由光接收端接收，再傳至該控制器以判斷偵測光之光衰退率。控制器判斷出頸部的液滴之光衰退率超過設定值表示點滴瓶頸部內有液體，未超過設定值表示點滴瓶頸部無液體，並發出控制訊號至警示器，驅使警示器發出警示信號。藉此，本發明的針筒偵測警示裝置可在滴管瓶頸部之點滴排空前通知醫護人員，進行該點滴瓶地拆卸更換，可使醫護人員有效節省來回查看的時間。
