Energy storage converters are widely used in power systems, new energy vehicles, wind power generation and other fields, and are of great significance in grid peak shaving, valley filling, smoothing new energy fluctuations and other aspects. The sampling part plays an important role as a bridge between the primary and secondary side control of the energy storage converter device. The accuracy of the sampling part directly affects the accuracy of the control algorithm. The sampling part of this paper includes a sampling circuit, a conditioning circuit and a calibration design. The sampling circuit is composed of a Hall voltage and current sensor. The AC voltage and current signals output by the sensor cannot be directly input to the A/D converter of the DSP. The output values need to be converted into 0 to 3V signals through the signal conditioning circuit and then input to the A/D converter. The calibration design is to calibrate and normalise the digital quantity output by the A/D converter, and then apply it to the control algorithm to improve the speed of the control algorithm. Finally, the accuracy of the sampling is verified by comparing the oscilloscope waveform with the upper computer sampling waveform through precharging experiments and energy storage discharge experiments of the energy storage device.