The present invention provides a power transmission equipment operation condition monitoring method and device and belongs to the power system field. With the method and device adopted, objective andquantifiable monitoring of the operating condition of power transmission equipment is realized. According to the technical schemes of the invention, the method includes the following steps that: the operation information of target category equipment in a region to be monitored within a time period is obtained; the operation quality value of the target category equipment of target providers is determined according to the operation information of the target category equipment and preset power transmission equipment operation quality evaluation rules, wherein the target category equipment is provided by M providers, wherein M is greater than or equal to 1; whether the operation quality value is smaller than or equal to a first threshold value is judged, wherein the first threshold value isthe minimum operation quality value of the target category equipment; and if the operation quality value is smaller than or equal to the first threshold value, early warning signals are outputted.