The invention discloses a historical sampled data caching method for a super-large scale power grid regulation and control system. historical sampled data of certain time range is cached in a server, as a power grid dispatching control system generally inquires historical data within 10 days, historical sampled data within 10 days can be accessed directly in the cache so as to avoid most direct access to a historical database, on the one hand through direct access of the memory, the access efficiency can be greatly improved, and on the other hand, the historical database load is also reduced, the dependence of historical data service on the historical database is lowered, various forms of access interfaces are provided to fit various application needs. Therefore, the method provided by the invention has good application prospect.