The fluorescent fiber optic temperature online monitoring system for switchgear is an intelligent device designed for measuring temperature at electrical contact points in power switchgear where high temperature requirements are critical. It integrates functions such as real-time temperature monitoring, early warning, data transmission, temperature display, and over-temperature recording into a single electrical contact temperature measurement device. The system provides an RS485 communication interface and adopts standard communication protocols, enabling rapid integration with third-party terminal equipment and computer monitoring systems for networked applications, facilitating centralized data collection and forwarding. Utilizing fiber optic sensing technology, the product is fully insulated against electromagnetic interference and high voltage, ensuring stable operation in various complex electromagnetic environments with high reliability.