The product utilizes optical fiber transmission technology for temperature measurement, which can realize temperature measurement in harsh environments such as high temperature, strong electromagnetic interference, and explosive. It has the characteristics of high precision, high reliability, and maintenance-free, and is suitable for temperature measurement in industries such as petrochemicals, metallurgy, electric power, aerospace, and so on. The optical fiber temperature measurement host can realize real-time monitoring and data processing through a computer or controller, and can also be remotely alarmed and controlled through an alarm device.