The invention discloses an electric power system accident remote monitoring information error reason analyzing method. The electric power system accident remote monitoring information error reason analyzing method comprises steps that an electric power system accident actual situation reported by a substation operation and maintenance staff is received, and accident opening signals are checked in a one-by-one way by aiming at the electric power system accident actual situation; when the accident opening signals are inconsistent with the electric power system accident actual situation, electric power system accident remote monitoring information error reason analysis is carried out; according to the different situations such as the missing transmission and the error transmission of the accident opening signals, whether accident total signals, protection motion outlet signals, and a switch tripping location signal of a substation at a corresponding moment are missed is checked sequentially, and telemeasuring data is checked, and then the reason causing the accident remote monitoring information error is analyzed and determined in a layer-by-layer way. Equipment or information links causing the accident opening signal error can be analyzed and located according to remote monitoring signals of a scheduling main station, and a clear direction is provided for subsequent shortcoming elimination, and therefore the modification efficiency of the monitoring information is improved, and the timely performance of the maintenance of the remote monitoring information is guaranteed.