The utility model discloses an online temperature monitoring system, including pan -tilt camera, background controller, the power network case of being connected with pan -tilt camera and send the ware with radio signal that background controller is connected is installed in the signal receiver of power network incasement portion, the signal transmission ware be connected with signal receiver, wherein: pan -tilt camera include the cloud platform with install the cloud bench take the photograph the camera case, it has infrared camera, visible light camera, concentrator, heater and heat dissipation fan to take the photograph camera case internally mounted, concentrator one end is connected with infrared camera, visible light camera, signal receiver is connected to the other end, dispels the heat to install on the lateral wall of taking the photograph the camera case, it has camera 2 to take the photograph camera case camera 1. Compared with the prior art, the utility model discloses not only have the await measuring function of some temperature of real -time supervision, can also report monitoring system's operating condition itself in real time to have under adverse circumstances advantages such as normal work.