The utility model discloses a sulfur hexafluoride monitoring system based on display instrument on spot, wherein, monitoring pipe installs the gaseous tee bend of deriving on the road, gaseous derive export of three -way with the gas circuit intercommunication of sulfur hexafluoride density meter, the gaseous upward connection pressure acquisition sensor of another export of three -way that derives, pressure collecting sensor electricity is connected to display instrument pressure signal input channel on the spot, on the spot the display instrument contain the control unit, display element and be used for with the transport module of master -control room communication, the quantity of SF6 circuit breaker is a plurality of, and the air chamber internally mounted of a SF6 circuit breaker in the SF6 circuit breaker installed in same indoor environment has the temperature sensor who is used for measuring the SF6 gas circuit breaker temperature, the temperature sensor electricity is connected to the binding post of display instrument on the spot, all pressure collecting sensor electricity of the SF6 circuit breaker of same indoor environment are connected to same display instrument on the spot.