In order to better meet the transformation needs of the current distribution network, a non-contact voltage sensor based on printed circuit board (PCB) structure is designed in this paper. The structure of PCB reduces the insulation requirements of the sensor and improves the measurement accuracy, with very low cost, flexible installation and easy maintenance. In this paper, the theoretical study and transfer function analysis of the proposed method were first carried out, and then the feasibility of the designed differential probe was verified by simulation. On this basis, the hardware circuit of the sensor was designed. Finally, the precision test of the sensor prototype was carried out. The test results show that the sensor has a high linearity of voltage measurement, the linear fitting value is 0.9998, the maximum reference error of output voltage relative to the fitting curve is 0.61%, and the phase relative error is 1.3%.