The invention relates to a high-voltage breaker temperature online monitoring system based on wireless communication. The high-voltage breaker temperature online monitoring system comprises temperature sensors, an analog-to-digital converter, a single-chip microcomputer, a wireless communication interface, a wireless communication unit, a control room control module, a PNP triode, a diode, a relay, an alarm and the like. Online monitoring for high-voltage breaker contact temperature is achieved through the temperature sensors and the wireless communication technology, a relationship between the breaker contact temperature and a working state of the breaker contact temperature is established, the object of state maintenance for a breaker is achieved then, and high-voltage breaker temperature online monitoring system is of great significance to improve the maintenance of the breaker without power interruption and avoid insufficient overhaul.