The invention provides a timing sequence voltage data storage method and system. The timing sequence voltage data storage method includes the steps of recording real-time voltage data and a recorded moment of the real-time voltage data, comparing the date of the current recorded moment with the date of a previous recorded moment, directly conducting integrity filling on the real-time voltage date according to date and minute marks of the recorded moment if the two dates are same, if the two dates are different, conducting integrity filling on data at the previous recorded moment, storing the date of the current recorded moment, conducting integrity filling on the real-time voltage data at the current recorded moment, and finally storing the real-time voltage data according to date and minute marks of the current recorded moment. In the whole real-time voltage data storage process, single storing time for each historical voltage datum is not required, the recorded date is required only, all the voltage data can be recorded according to the date and minute marks, data volume caused by time scale storing is greatly reduced accordingly, and the disk space is saved.