The invention provides a data comparison method, device and system. The data comparison method comprises the following steps: converting, i.e., converting multiple data items contained in each of an acquired first data set and an acquired second data set by utilizing a distributed computing architecture, so that the converted data items have a uniform data structure, wherein the uniform data structure comprises multiple fields; comparing, i.e., comparing the multiple converted data items in the first data set and the second data set according to a configuration file by utilizing the distributed computing architecture. A client can make a brief or detailed configuration for data comparison according to needs by utilizing the configuration file, thus realizing quick and efficient comparison on big data by utilizing a distributed platform.