The invention relates to variable-frequency oil-water separation equipment. The variable-frequency oil-water separation equipment comprises a heater, a vacuum separation tank, an outlet pump group and a liquid inlet pipeline. The liquid inlet pipeline is connected to the heater, the heater is connected with the top end of the vacuum separation tank through a pipeline, and the tail end of the vacuum separation tank is connected with the outlet pump group. An air supply pipeline is connected to the lower end of the side wall of the vacuum separation tank, an exhaust pipeline is arranged at the top end of the vacuum separation tank, and a vacuum pump, a water-air separator and a heat exchanger are sequentially arranged on the exhaust pipeline from left to right. A filter screen of the water-air separator and the heat exchanger are respectively connected with a water storage tank. A fluid outlet pipeline is arranged at the bottom end of the vacuum separation tank, and an outlet motor of the outlet pump group is under variable-frequency control. Due to variable-frequency control of the outlet motor of the outlet pump group, stability of oil position in the tank can be guaranteed, frequent starting of the motor due to liquid level fluctuation is avoided, and accordingly energy sources are saved; in addition, water content of sealing oil in the vacuum pump is reduced, the service life of the vacuum pump is prolonged, and dewatering speed is increased while dewatering efficiency is improved.