SF6 breaker monitoring system

The utility model discloses an SF6 breaker monitoring system. The SF6 breaker monitoring system comprises a direct-current power supply, a first intermediate relay, a second intermediate relay, an SF6 density controller and a microcomputer protection, measurement and control device. When the SF6 density controller detects that the pressure value of SF6 gas in an SF6 breaker is smaller than a pressure alarm set value, a first set of normally-opened contacts of the SF6 density controller are closed, a coil of the first intermediate relay is powered on, normally-opened contacts of the first intermediate relay are closed, and a microcomputer protection, measurement and control device outputs a low gas pressure alarm signal; When the SF6 density controller detects that the pressure value of SF6 gas in the SF6 breaker is smaller than a pressure locking action value, a second set of normally-opened contacts of the SF6 density controller are closed, a coil of the second intermediate relay is powered on, normally-opened contacts of the second intermediate relay are closed, and the microcomputer protection, measurement and control device outputs a low gas pressure locking signal.