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The power consumption of tractor’s electrical components has a great effect on its economic performance, which was awfully neglected in the past. By matching the electrical components properly, and keeping its work condition in the economic zone of engine, the engine’s combustion efficiency can be improved greatly. The integrated virtual testing system for tractor electrical performance was designed, which aimed to meet the research requirements on the tractor power consumption test, electrical components match, etc. Firstly, the hardware selection was determined based on the requirement analysis of tractor electrical performance test. Then, the test system based on NI cRIO controller was designed, which can complete the synchronous acquisition of battery and generator terminal voltage and current, engine speed and tractor velocity, temperature, and so on. Consequently, the virtual software design of the test system was described in detail, including FPGA software, realtime software and PC data acquisition and analysis software. Finally, the field tests were conducted, which included the engine start test, the power consumption tests for each electrical component, and the electrical balance test for the whole tractor electrical circuit when the engine was started. According to the current accuracy comparison tests and tractor field tests, both the current samples accuracy and the system work function and reliability were validated. The research result provides an effective means to comprehensively evaluate and analyze the tractor electrical performance.