Abstract: Traditional RV reducer test-rig can only complete the performance test of one type of RV reducer, which causes great waste. In order to overcome the above shortcoming, a design method of test-rig of RV reducer with replaceable types is proposed. Firstly, the composition of RV reducer test-rig is introduced and the theoretical analysis of test-rig design of RV reducer with replaceable types is completed. Secondly, the three-dimensional models of test-rig of RV reducer with replaceable types are established and the assembly and motion analysis of different RV reducer types on the test-rig are completed. Finally, the actual machining of components and parts, installation of test-rig of RV reducer with replaceable types and test measurement are completed, which verifies the feasibility of the proposed method.