In order to realize efficient water-saving irrigation of strawberry greenhouse in precision agriculture, the paper proposed an automatic irrigation algorithm based on fuzzy comprehensive evaluation irrigation based on PLC and the configuration software, and build a remote control system. By measuring the greenhouse soil parameters and strawberry soil moisture data to determine the upper and lower limits of irrigation and set buried position of moisture sensors. Use fuzzy comprehensive evaluation method to handle multi-sensor data, and develop an automatic irrigation control algorithm that depends on the strawberry irrigation system. Set up a C / S mode of automatic irrigation control system through the 3G network and the remote computer. The experimental results show that the algorithm is reasonable and reliable, and can be well adapted to the strawberry greenhouse. The automatic irrigations meet the steady demands for real-time performance and high scalability. The irrigation automation of strawberry greenhouse provides a theoretical and practical basis for intelligent irrigation of strawberry greenhouse.