The invention discloses an electricity big data querying method and system based on HBase secondary indexing. The method comprises the steps that 1, a secondary indexing table is set up; 2, whether a data table is updated or not is judged, if yes, the secondary indexing table is updated, and if not, the secondary indexing table is not updated; 3, the secondary indexing table is used for querying data. According to the electricity big data querying method and system, basic updating operation can be achieved, joint querying and selecting querying operation between data tables can be efficiently achieved for each specific service, and therefore supports for complex service requirements are achieved.