Energy-saving control method and system for central air conditioner

The invention provides an energy-saving control method and system for a central air conditioner. The method comprises the following steps: acquiring environment information in a building, and obtaining a load grade of the current building according to the environment information in the building; the operation parameters, the actual temperature, the actual humidity and the chilled water supply and return water temperature difference of the central air conditioner terminal equipment are obtained every preset time period, and the chilled water flow is adjusted according to the obtained information; the building load grade, the temperature and humidity set by the end equipment, the actual temperature value, the actual humidity value and the energy consumption are uploaded to a database, the database analyzes data, and when the energy consumption of the air conditioner is abnormal, alarm information is sent out; the system corresponding to the method comprises a building environment information obtaining module, a