Abstract: Aiming at the problem of network insecurity and unreliability of agricultural machinery scheduling system, the network security of agricultural machinery scheduling system based on big data technology was optimized. The agricultural machinery scheduling system was constituted of vehicle information acquisition system, monitoring information management system and client monitoring system. To improve the network security of agricultural machinery scheduling system, the network security was designed, the network security was evaluated by artificial neural network model, and the network security situation prediction model was also designed. To verify the property and network security of the agricultural machinery scheduling system, the network security evaluation test and the scheduling test were done. The test results show that the network is safe, and the system could accomplish the task efficiently.