Spherical buoys are used to measure the parameters of sea waves.After working for a period of time,the accuracy and reliability of the measurements will decrease,and they need to be returned to the laboratory for maintenance and calibration.Therefore,a set of spherical buoy test device was designed.The hydraulic proportional servo system was used to drive the buoy clamp with spherical buoy inside to simulate the motion under the action of sea waves,and the performance test of spherical buoy in indoor environment was realized.This device provides good experimental conditions for the development of new buoys,improving the detection quality and efficiency of buoys,and is conducive to the development of marine environment monitoring instruments and equipment in China.