No-load and load tests are routine tests for transformers. The test equipment required for no-load and load tests of large transformers is bulky and heavy, and the test equipment needs to be lifted, fixed, transported, unloaded, and reassembled and wired. This process has certain transportation risks and low efficiency. To solve this field test problem, this paper designed an No-load and load test platform by using SolidWorks, and integrated variable frequency power supply, intermediate transformer, instrument transformer set, capacitor set and other test equipment into two test vehicles. Through gravity center analysis, 3D mechanical simulation, equipment bolt fastening scheme design, and finally developed the test platform according to the analysis results. After long-distance driving and field test, the on-board equipment is stable and has no eccentricity or deviation problem, and the field test efficiency is increased by 3 times.