The present invention provides a log data fragmentation and query method and apparatus. The method comprises: acquiring a code of each entity in log data and performing the hash operation on each entity code; acquiring one data fragment; then performing sequential sorting on log information in each data fragment according to the codes of the entities of the log information; acquiring a data grouping list; and completing query of the log data according to the codes of the entities. The method provided by the present invention is high in data query efficiency and speeds up analysis on the log data, so that a more scientific decision is obtained.