The invention belongs to the field of computers, and particularly relates to a grouping repair code construction method for non-uniform fault protection and a fault repair method. According to the grouping repair code construction method, files with different heat degrees in an actual distributed storage system are considered; the whole strip is divided into a plurality of data groups with the lengths sequentially increased through the grouping thought, a plurality of group coding blocks are generated in the groups, different levels of protection are provided for files with different heat degrees through selection of the grouping scales, and the disk reading expenditure of multiple fault nodes is further reduced. According to the method, the fault probabilities of the stored target nodes represent the fault probabilities of the data blocks and are ranked, and higher-level protection is provided for the high-fault-probability data nodes. According to the multi-node fault repairing method, during multi-node fault repairing, the overall repairing principle that repairing is conducted in a data packet first and then global repairing is conducted is selected, and the disk reading expenditure during multi-node repairing is reduced as much as possible.