The invention relates to a detecting system for a distribution network switch cabinet. The detecting system comprises a remote monitoring end and multiple detecting ends, the detecting ends comprise multiple infrared temperature measurement units, wireless humidity detecting units and monitoring units, the infrared temperature measurement units and the wireless humidity detecting units are separately connected with the monitoring units, the monitoring units are connected with the remote monitoring end through a network, the infrared temperature measurement units are fixed to the side walls ofthe switch cabinet and the back face of a cabinet door through horizontal movement devices, and the monitoring units are arranged on the front face of the switch cabinet door. The detecting system hasthe advantages that infrared temperature measurement is adopted, contact with components is not needed, and cooling of the components is not affected; the infrared temperature measurement units and the horizontal movement devices are arranged, so that temperature detection is comprehensive; an image processing technology is adopted for selecting too-high-temperature points conveniently and rapidly.