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In view of the traditional UAV temperature detection system for unmanned aerial vehicle (UAV) chassis temperature variation signal detecting low real-time and accurate, was designed and implemented based on DS18B20 temperature sensor correlation model of unmanned aerial vehicle (UAV) chassis temperature variation signal detection system, according to the measurements of the temperature on different position is different, different location of the associated model is set up, using the correlation coefficient between the temperature sensor, judge the temperature of different position signal is normal, and the temperature variation signal sounded the alarm. The hardware design mainly includes the temperature sensor detection circuit, data processing module, sound and light alarm module, etc.; Software design mainly includes the work process, the real-time temperature sensor DS18B20 correlation program implementation, etc. Finally extracted 100 flights for unmanned aerial vehicle chassis testing temperature testing experiment, through the temperature sensor DS18B20 temperature data of unmanned aerial vehicle (UAV) case actual testing, the results show that chassis internal temperature around the temperature change and a cooling fan around the module differs within 0.5 ℃, the average temperature changes in the range of allowable error, correlation is very large. In addition, compared with the traditional system, in this paper, the detection accuracy of the system is as high as 95% above, and the stability is strong, providing a credible guarantee for the safety of the unmanned aerial vehicle (UAV) flight.