The invention provides a voltage data correction method for an SCADA system of a power distribution network. According to the voltage data correction method, power system structural information, SCADA measurement power data, SCADA measurement current data, PMU voltage measurement data, and power system event record data are utilized; four links of wrong data initial removal, multi-source data verification, same-source same-site data verification and same-source multi-point multi-measurement information verification are preformed for quality detection and correction on the voltage data of the SCADA system. The voltage data correction method provided by the invention is efficient, accurate and reliable, and the voltage data correction method can effectively identify and correct various types of wrong data and the data with larger error in the power gird in time, can judge whether mistakes exist in the voltage measurement values or not and can judge the types of the mistakes, as well as can give out the estimated value and the numerical value precision of the voltage values according to other measurement values; therefore, the data quality of the power distribution network is improved, and the security and the reliability of the power distribution network are further ensured.