In order to achieve the capability of continuous variable sideslip angle in 1m transonic and supersonic wind tunnel, expand the scope of test technology and improve the test efficiency, a continuous variable roll angle test device was developed. The technical requirements, structure design and simulation results of the device are introduced, as well as the software and hardware design of the supporting control system, and the results of electromagnetic compatibility test, static load test and wind tunnel test verification of the whole device system are given. The simulation, test and wind tunnel results show that the device has good electromagnetic compatibility in the wind tunnel field environment, and can effectively bear the load requirements of the wind tunnel test; At the same time, the test data of the continuous variable roll angle test device has good repeatability, and the test data of the “conventional force measurement middle bracket + 12 ° double shaft” support mode is basically the same, and the small deviation is related to the support interference of the two modes. The device has high control accuracy, and its running speed and range meet the technical requirements, so it can be applied to wind tunnel test in engineering.