The invention discloses an association rule mining method based on mass data and relates to the technical field of information processing. The association rule mining method specifically comprises the steps that input data are divided according to records, a frequent 1-itemset table is set, data projection is carried out on the frequent 1-itemset table, the projected data are stored in a set grouped table, a local frequent pattern tree is set, then data association rule mining is carried out on the frequent pattern tree, in the process of mining on the frequent pattern tree, a pruning strategy is adopted, the number of iterations of the association rule mining is reduced, each computation node only processes one part of data records, and therefore the problem that the mass data can not be read into a memory by one computer to be processed is solved. In addition, various nodes participate processing in parallel, and processing efficiency is improved effectively.