The invention provides a system and a method for storing and accessing power utilization efficacy data. Through conducting priority level distribution on packaged data and optimizing a data storage strategy, the storage efficacy of the power utilization efficacy data is improved; and by adopting a synchronous storage manner, the storage quality of the power utilization efficacy data is improved, the withdrawing efficiency of the power utilization efficacy data is also greatly increased, the integrity of the power utilization efficacy data is guaranteed and smooth operation of the system is guaranteed at the same time.