The invention relates to a data query method and device, and belongs to the field of databases. The method comprises the following steps that: receiving the query request of a client side, wherein thequery request of a client side comprises query data; according to the query request, inquiring the target secondary index of a main index to obtain a target line major key corresponding to the querydata; obtaining index data in the target index line corresponding to the target line major key from the main index; and providing the index data in the target index line for the client side. By use ofthe method, the target secondary index is inquired through the query data to obtain the line major key corresponding to the query data, index data of at least two second index rows are recorded in afirst index row of the target secondary index, then, the index data corresponding to the line major key is obtained, and the problem of low query efficiency when query is carried out in the relevant art is solved. An effect that the index data in a plurality of second index rows can be inquired through one-time query can be achieved, a query process is simple in operation, and query efficiency ishigh.