The invention provides a treating method of a fault information system sub-station for overhauling state of a protective relaying device, comprising the steps of installing a plurality of hard pressure pads on a sub-station cabinet with each pressure pad corresponding to one space, manually inputting the pressure pads corresponding to spaces when the device is overhauling, manually outputting thepressure pads corresponding to spaces when the overhauling is finished, and sending a state information of pressure pad to the sub-station in a communication mode by connecting to a device with a function of collecting input quantity, for identifying whether each space is at overhauling state. The sub-station identifies the protective relaying device at overhauling state according to the information of pressure pad. The method is complete and useful, perfects the content classification of information on the protective relaying device, solves the problem that the domestic protective relaying fault information management system can not identify the overhauling state and the function at running state of the protective relaying device, is beneficial for the professionals of relay protection to analyze the protecting action, and promotes the integrate practicability of the system.