The invention discloses a power supply for an IC verification tool. The power supply comprises a microprocessor, a digital analogue converter, a voltage regulation circuit, an electric signal feedback circuit, a minitype relay and a minitype relay driver. The microprocessor is used for dynamically adjusting the voltage value of the output end of the voltage regulation circuit through electric signals fed back from the electric signal feedback circuit, so that the output voltage of the power supply cannot change along with the power consumption of an IC to be tested. Besides, the minitype relay is arranged between the output end of the voltage regulation circuit and the IC to be tested, and power supply or power interruption on the IC to be tested can be realized through control of the minitype relay driver by the microprocessor. Compared with the prior art, a power switch is not provided, so that the possibility that a chip is damaged due to charged operation is reduced; besides, the used minitype relay is not a PN junction, but is a mechanical switch, so that the influence of leakage current is avoided, and the power consumption can be accurately measured.