A method for verifying the bandwidth and phase of a digital power control system according to the present invention includes steps of: A. Disturbance Order Reading in which an A/D conversion unit receives an analog signal order and mix it with existing command components in a digital system unit; B. Phase Delay Compensation in which a phase lead compensator is designed that is based on the different sampling frequencies and time delay parameters of the digital system unit, and the phase lead compensator is added to the digital system unit; and C. System Measuring in which a mixed wave calculation unit and a supply unit are added to the digital system unit to make the analog command signal pass through the digital system unit and the mixed wave calculation unit to the supply unit and to further drive a power circuit.