Civil air defense basement ventilation system

The utility model provides a civil air defense basement ventilation system which relates to the technical field of civil air defense engineering and comprises an air inlet channel, an air outlet channel is fixedly communicated with the position, close to the bottom, of the outer surface of the left side of the air inlet channel, and a mounting frame is fixedly connected with the position, close to the right side, between the inner surface walls of the air outlet channel. An exhaust fan is fixedly mounted between the inner surface walls of the mounting frame, and a second mounting shell is arranged at the position, close to the right side, of the top of the air outlet channel. According to the civil air defense basement, the heating device is matched with the exhaust fan, so that the effects that air in the air outlet channel is heated, and then hot air is exhausted into the civil air defense basement through the air outlet are achieved; according to the civil air defense basement, air in the air outlet channe