The invention provides a determination method for a high frequency generator tripping scheme of a hierarchical aggregation external transmission grid power. The method comprises steps that a district high frequency generator tripping scheme C1 for solving a high frequency problem during district grid power splitting in a regional grid power is set; a high frequency generator tripping participation scheme C2 is set for the regional grid power for cooperatively solving a high frequency problem during splitting of a provincial grid power of the regional grid power and other grid powers; a high frequency generator tripping scheme C3 is set for the regional grid power for solving a high frequency problem during splitting of the regional grid power and a main grid power of the regional grid power of the regional grid power; the district high frequency generator tripping scheme C1, the high frequency generator tripping participation scheme C2 and the high frequency generator tripping scheme C3 are verified and corrected. Through the method, segmental setting for start generator tripping frequency constant values of the high frequency generator tripping scheme of the hierarchical aggregation external transmission grid power is carried out, so the different generator tripping schemes are effectively prevented from generating interference when splitting high frequency faults in different levels occur, and thereby coordination among the different generator tripping schemes for solving different high frequency problems is guaranteed.