The invention provides a method for repairing a SV sampling data defective point in the digitization sampling process of an intelligent substation. The method is applied to data processing of intelligent substation process level devices, time abnormal data points or data points around the obliterated data points can be used for supplementing, or an ineffective data frame can be directly formed through marking, and the resampling aim can be achieved; the method includes the steps of SV data point overlarge shake time amendment, one-obliterated-data-point amendment, two-continuously-obliterated-data-point amendment, three-continuously-obliterated-data-point amendment and four-continuously-obliterated-data-point amendment. By means of the method, the data accuracy and the resampling fault tolerance after resampling is carried out on SV original sampling data through a relay protection device are improved.