Abstract: At present, there is no instrument for waste resin or water interface measurement at home and abroad. Based on the magnetostrictive principle, a measurement method of waste resin / water interface using driving device as auxiliary means is proposed. On this basis, the overall design of the measurement system is carried out, and the corresponding measurement system is designed. The designed system is verified by experiments. The test results show that the measurement system realizes the measurement of waste resin or water interface, and is with the characteristics of high measurement accuracy, miniaturization, modularization, adjustable lifting speed, and easy installation and maintenance. The successful development of the system solves the problem of waste resin or water interface measurement, and it is worthy of promotion and further engineering application in the process of radioactive waste liquid treatment.