At present,there are problems such as large radiation,high temperature,and inconvenient measurement in the detection of ultraviolet light energy on the market. An on-line detection scheme for ultraviolet light energy guided by an optical fiber at a high temperature is designed. The scheme transmits ultraviolet light through the optical fiber to the photoelectric sensor for photoelectric conversion processing,avoids the high temperature operation of the sensor,and uses the dual sensor to perform environmental light filtering to improve the accuracy. Then a high precision AD chip is used to convert the signal analog quantity into a digital quantity transmission to the main controller STM32F103.The corresponding parameters such as energy value and temperature are calculated after data processing,and the data is transmitted to the upper computer through the RS485 bus transmission mode to realize real-time monitoring. The experiment shows that the whole system runs stably,withstands high temperature,and can detect and analyze ultraviolet energy changes online and in real time.