The embodiment of the invention discloses a data processing method. The method comprises the following steps: receiving a data processing instruction; obtaining first partition data and second partition data according to the data processing instruction; performing sorting processing on the first partition data through a Mapper to obtain first to-be-combined data, and performing sorting processingon the second partition data to obtain second to-be-combined data; and performing merging processing on the first to-be-merged data and the second to-be-merged data through Reducer to obtain target connection data. The embodiment of the invention further discloses a data processing device. According to the embodiment of the invention, the data sorting process is completed in the Mapper, and the Reducer only needs to complete the data merging process, so that the data processing delay of each Reducer is reduced, and the execution efficiency of the Join is improved.