A power supply compensation, particularly relating to a customer intelligent reactive power automatic compensation energy-saved device, which includes an intelligent reactive power compensation regulator, a plurality of branch capacitor control contactors, a plurality of capacitor banks and a current transformer. The intelligent reactive power compensation regulator is provided with a sampling current input, a sampling voltage input, an external AC contactor power bus and a plurality of output control lines, the sampling current input is connected to the current transformer, the sampling voltage input is connected to the power supply, the external AC contactor power bus is connected to a live wire of the power supply, the capacitor banks are connected to the power supply through the branch capacitor control contactors.