Self-flowing prevention liquid adding mechanism

The utility model provides a self-flowing prevention liquid adding mechanism, and relates to the technical field of liquid adding, the self-flowing prevention liquid adding mechanism comprises a quantitative control unit, a liquid storage tank, a reaction tank, a conveying pipeline, a conveying pump, a metering structure, an electromagnetic valve structure and a non-return structure, the conveying pump, the metering structure and the electromagnetic valve structure are sequentially arranged on the conveying pipeline and connected with the quantitative control unit, the check structure is provided with a valve body, an elastic piece and a reset piece, the valve body is installed on the conveying pipeline and provided with a liquid inlet and a liquid outlet, the elastic piece is arranged at the position of the liquid inlet and movably abuts against the liquid inlet, and the reset piece is arranged in the valve body. According to the liquid adding device, the elastic piece is matched with the reset piece to bloc