The invention relates to a power transmission line abnormity time-space multi-dimension analyzing method. The method is characterized in that: 1. Using an online monitoring apparatus to collect power transmission line abnormity information which includes power transmission device overall condition, weather conditions and geological conditions; b. on the basis of abnormity information, in combination with time determination conditions and space determination factors, conducting overlay analysis, determining the type of abnormity condition; and c. in combination with power grid data, automatically determining the level of the abnormity condition, and on the basis of the abnormity condition, starting corresponding handling procedures.