The invention relates to a remote automatic control method of a high-voltage shut reactor, which takes the safety of system voltage in consideration and belongs to the technical field of automatic voltage control of power systems. The method comprises the following steps: setting a bus voltage out-liming aggregative indicator X and taking the bus voltage out-liming aggregative indicator X as the criterion to judge that the high-voltage shut reactor automatically exits from running; and setting a bus voltage restored aggregative indicator X' and taking the bus voltage restored aggregative indicator X' as the criterion to judge that the high-voltage shut reactor automatically restores the commissioning after automatically exiting from running. By acquiring grid data on line and calculating X and X' in real time, the invention realizes the on-line remote automatic control of the high-voltage shut reactor; and the invention can automatically cut off the high-voltage shut reactor in emergency and automatically commission the high-voltage shut reactor after the system restores to normal state, thereby ensuring safe and stable running of the grid.