Central air conditioning system for liquid cargo ship

The invention relates to the field of shipbuilding, in particular to a central air-conditioning system for a liquid cargo ship, which comprises a personnel accommodation cabin, a central air conditioner, a central air-conditioning system, a central air-conditioning system, a central air-conditioning system and a central air-conditioning system, and is characterized in that the central air-conditioning system can process mixed outdoor fresh air and indoor return air and send to the personnel accommodation cabin; the second fresh air opening is formed in the position far away from the hazardous gas generation source and is connected with the central air conditioner through a second fresh air pipe; the balance fan is arranged on the second fresh air pipe between the second fresh air opening and the central air conditioner, is started to operate only under the working condition that hazardous gas is generated, can overcome the resistance of the fresh air pipe caused by the fact that the second fresh air pipe is a