Full-automatic gas collecting and exhausting device of large cold and hot water system

The utility model discloses a full-automatic gas collecting and exhausting device of a large cold and hot water system. The device comprises a gas collecting tank arranged above a cold water system pipeline and a hot water system pipeline, wherein the gas collecting tank is connected with a cold water system pipeline and a hot water system pipeline through connecting pipes, an electrode type liquid level device is installed on the gas collecting tank, an automatic exhaust valve and a normally-closed electromagnetic valve are installed on two branches of an exhaust pipe of the gas collecting tank respectively, and signal lines and control lines of the normally-closed electromagnetic valve and the electrode type liquid level device are connected with a control cabinet respectively. The control cabinet controls the normally-closed electromagnetic valve to be opened and closed through the control line according to high and low liquid level signals fed back by the electrode type liquid level device, when the contr