The invention provides an infrared thermal image detection system and method based on 4G network transmission, and relates to the technical field of temperature detection. The system comprises a 4G module, a far infrared thermal image module, a cloud server, and a terminal. The far infrared thermal image module is connected with the 4G module; the 4G module is connected with the cloud server; andthe cloud server is in communication connection with the terminal. 4G communication is adopted to continuously acquire data, so that the labor intensity of workers is reduced, and the system cost is reduced.