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Aiming at the problem of storage and use of cryogenic medium, a digital prototype of high-precision capacitance liquid level measurement system was designed. The structure of capacitance level meter was optimized by combining continuous and segmented. The system’s hardware part took the microcontroller as the core, which converted the change of capacitance into digital signal, and realized the communication with the host computer by the network interface. The performance of the system prototype was tested and verified by the capacitance calibration instrument and liquid hydrogen. The results show that the capacitance measurement accuracy of the system is better than 0.1pF, and the liquid hydrogen level change of 1.37mm is able to be distinguished effectively, which meets the accuracy requirements of cryogenic liquid level measurement.