The invention discloses a big data processing distributed cache system and method thereof. The method includes the steps of: dividing a big data processing server into a plurality of cache units, and storing data in the form of key-value pairs in each cache unit; according to the accessed frequency of the cache units, calculating value of the cache units and sorting the cache units, and extracting all cache units in a preset value threshold value range; and clustering all the extracted cache units in the preset value threshold value range, and allocating a preset clustering number of cache units to any cloud computing cache node for storage. The method provided by the invention enables network data transmission between nodes to be reduced when data are accessed or processed, thereby shortening the processing time, and effectively improving the efficiency of big data processing.