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In view of the characteristics of long monitoring period and great environmental interference in the process of farmland environmental data collection, a wireless sensor network real time monitoring system for paddy environmental information based on hybrid antenna was designed, used cluster routing protocol to networking, configured different types of antennas for different types of nodes, and a turntable was used to control the direction of the directional antenna sink node to expand the coverage of the network and improve the stability of the system. The networking experiment was carried out in paddy based on the system for a long time, and the network packet loss rate and the acquisition accuracy of paddy environmental parameter were tested, the test results show that the system runs stably and the measurements are accurate, the average network data packet loss rate is 0.44%, and the average relative error of paddy air temperature, air humidity and soil moisture content are 0.26%, 0.64% and 0.33% respectively.