Abstract: In order to detect real-time power consumption of high stubble buried device in paddy field based on virtual instrument and principles of phase difference, power consumption testing system of high stubble buried device in paddy field was developed. By using the correlation method, FFT method and zero-crossing method of data processing methods to compile program, then the system was calibrated on the experiment bench. The results showed that the system based on the correlation method had the best accuracy, stability and linearity, and its error was lower than 4.5%. It can meet the requirement of agricultural machine field experiment.