The invention discloses a power supply device used for a metering device, comprising a rectifier bridge output filtering capacitor, a transformer secondary side output filtering capacitor, a power supply output filtering capacitor, a zero cross detection circuit and a PFC controller. The rectifier bridge output filtering capacitor employs a CBB capacitor; the transformer secondary side output filtering capacitor employs a solid capacitor; the power supply output filtering capacitor employs a ceramic capacitor; a direct current bus voltage sampling circuit samples a direct current bus voltage and outputs the voltage to the PFC controller; the zero cross detection circuit detects the zero cross point of an output voltage, and transmits the zero cross point to the PFC controller; the PFC controller is used for outputting control waveforms to control the power supply device according to the output voltage, current signals and direct current bus voltage signals. According to the invention, an electrolytic capacitor with poorer performance is replaced, and the power supply is controlled by the PFC controller according to output voltage waveform characteristics, thereby increasing the power factor of the power supply device, reducing power grid harmonic wave pollution, and prolonging the service life.