The invention discloses a space meshing-based government affair big data mining method. The method comprises the following steps: determining the size of a space grid according to the space granularity of the data in government affair data sets; dividing the space grid and assigning the data in each data set to the grid as attribute values; and carrying out grid data storage and multi-dimensional data mining by taking a cell grid as a unit. According to the method, the data sets of different types are organized under a uniform time-space dimension, so that the mining of government affair big data in different types is effectively realized, and the depth of the information mining is greatly increased.