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The agricultural intelligent mobile platform is the premise and basis of farmland intelligent operation, so a prototype of agricultural intelligent operation was developed. It was consisted of mechanical system and control system. The mobile platform can navigate autonomously. It showed a certain openness which could meet various requirement of farmland intelligent operations. The autonomous navigation program and human-machine interface were programmed with VC++6.0. The field navigation tests of the prototype were carried out in the orchard of Feng county in Jiangsu province. Results revealed that this platform performed well in the integrated navigation mode and the error was 0.05m during straight path movement, whereas in curved path the error increased to 0.11m.