The invention relates to a system used for improving combined cycle generator set vacuumizing efficiency and saving air conditioner power utilization. The system used for improving combined cycle generator set vacuumizing efficiency and saving air conditioner power utilization comprises a regulator station area, a water pump area, a main factory building area and an office area. The system used for improving combined cycle generator set vacuumizing efficiency and saving air conditioner power utilization is characterized in that a water supply end of a water bath furnace in the regulator station area is connected with a cooling water supply pump in the water pump area through a water supply isolating valve. A water outlet end of the cooling water supply pump is connected with a water supply end of the main factory building area and a water supply end of the office area. The water supply end of the main factory building area is communicated with a water inlet end of a vacuum pump water-water heat exchanger set. A water outlet end of the vacuum pump water-water heat exchanger set is communicated with a return water end of the water bath furnace in the regulator station area. The water supply end of the office area is communicated with a water inlet end of an air conditioner cooler set. A water outlet end of the air conditioner cooler set is communicated with the return water end of the water bath furnace in the regulator station area. Through the connection, the system used for improving combined cycle generator set vacuumizing efficiency and saving air conditioner power utilization is formed. According to the system used for improving combined cycle generator set vacuumizing efficiency and saving air conditioner power utilization, temperature of working liquid of a vacuum pump is reduced and vacuum degree of a generator set is improved. Through injecting low-temperature cooling water in an air conditioner system, the energy-saving effect is achieved.