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Under the complex environment, in high power microwave heating equipment of the industry, accurate transmission of the analog signal is vital for the accuracy control and safety of the equipment. In view of the existing analog signal transmission scheme in complex electromagnetic environment of defects of low anti-interference ability, put forward an analog signal transmission solution based on optical fiber,and composed of V/F converter and FPGA. Through the simulation analysis and experimental verification, the analog signal transmission system complex electromagnetic interference resistance is superior to the existing scheme, high transmission precision at the same time, continuous transmission error is less than 0.1%.It provides a good performance for the analog signal transmission in industrial high power microwave heating equipment under the complex environment.