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GNSS controlled land leveling technology can improve farmland flatness effectively. To achieve saving the water and fertilizer, increase the effect of income so as to solve the problem on the lack of operation guidance and low efficiency in GNSS controlled land leveling system, a method of global path planning was proposed based on GNSS land leveling system. The theory of farmland leveling system was combined, and the conditions of farmland actual leveling were analyzed. Firstly, the actual condition of farmland was analyzed, and the farmland terrain environment model which was suitable for land-leveling was created, and then the farmland terrain information map was generated, from which the characteristics of farmland terrain distribution can be obtained. Under the condition of the least amount of invalid work about loaded and unloaded, and the condition of the least amount of steering and repetitive work, the traversal of the entire farmland land formation path was generated. The tension sensor was used to monitor the real time load of forklift. Then the simulated experiments were done and the data were analyzed, and the simulation results showed that compared with the conventional leveling method, in the method, the time of loaded and unloaded was significantly reduced, and the time of work was saved by more than 50%. The method can plan effective paths, reduce inefficient operating time, and increase the efficiency of land-leveling by more than 30%.