GNSScontrolled land leveling system is complicated to operate and farmland measuring is timeconsuming, in order to solve these problems, this paper aimed at developing a fast GNSScontrolled land leveling system. The system including the core processing platform, GNSS signal receiving device and hydraulic. The system can achieve the fast farmland reference design, graphic land leveling, slope land leveling; the farmland reference design meant realtime correction calculation of the reference plane prior operation and in operation without farmland measuring, which increased the accuracy; the algorithm of slope land design was optimized based on the early stage of the system algorithm，and the slope land leveling algorithm applied to the fast GNSScontrolled land leveling system was proposed. Since this system can work without farmland measuring, it can be applied to the paddy field leveling which couldnt be measured. After slope leveling, it can achieve the fast irrigation water and the uniform water coverage, reduce the amount of cutting and filling soil as well as improve the leveling speed. Longterm experiment was done to test the system and results showed that after the graphic leveling, the maximum elevation difference was decreased from 18.9cm to 8.1cm, elevation standard deviation was decreased from 11.2cm to 5.5cm, the average land leveling measuring point error was less than 5cm, and the cumulative percentage rose from 75.693% to 90.674%.After slope leveling, the actual farmland slope was similar to the designed slope, leveling speed was fast and leveling effect was good.