In the performance test of capacitive transducer, due to parasitic capacitance and electromagnetic shielding problems, it’s difficult to ensure the precision of capacitance value, so design a switched capacitor network to solve this problem. First, building the switched capacitor network module, through choosing low parasitic capacitance components and designing multiple layers PCB boards, can reduce the parasitic capacitance and improve the capability of electromagnetic shielding. Then, building 6 choose 1 module for data acquisition and processing. Furthermore, building processing central module based on STM32 for system control, data analysis and storage. Finally, carrying out different capacity value tests on capacitive transducer. The test results showed that the accuracy of capacity value reached ±0.04 pF in switched capacitor network module, and acquisition accuracy reached 4 mV. The experimental results verify the reliability and accuracy of this test system, and it provides an important reference for further development.