An embodiment of the present invention provides a device fault feedback system based on a cloud platform, comprising a thermal imaging device and a cloud platform, the thermal imaging device being connected to the cloud platform; the thermal imaging device comprises a portable thermal imaging detector and a portable thermal imaging detector connected to the mobile terminal. The current thermal image of the object is used to diagnose the defects; the cloud platform is used to store the historical thermal image data collected by the portable thermal imaging detector and receive the current thermal image, and based on the historical thermal image data and the current thermal image, large data processing and analysis are performed. The combination of the mobile terminal and the cloud platform enables the defects of the device object to be found in time, thereby improving the efficiency of solving the defects of the device object.