The invention provides an early warning method and equipment for a secondary circuit fault of a relay protection device. The method comprises steps of S1, acquiring recording files of the plurality of interrelated relay protection devices; S2, according to the recording files, if a first relay protection device that is uniquely triggered or only not triggered to start exists in the relay protection devices, determining that the secondary circuit of the first relay protection device is faulty, otherwise, determining that there is no fault. By determining whether there is a relay protection device that is uniquely triggered or only not triggered to start in the plurality of interrelated relay protection devices, it is possible to detect not only the steady-state fault inside the relay protection devices but also to effectively detect the intermittent hidden failure of the secondary circuit and send an early warning signal, so as to facilitate the timely elimination of hidden dangers and to maintain the safe operation of the power system.