The invention discloses a method and system for processing big data of electric power marketing. The method comprises: importing the structured business data and the external data in a marketing basic data platform database to a Hive database of a Hadoop ecological system, wherein the external data belongs to the data acquired from external websites; merging unstructured marketing basic data small files into a big HAR big file, and storing the HAR big file in a distributed file system HDFS (Hadoop Distributed File System); and preprocessing the data in the Hive database and the HDFS by using a programming computing frame MapReduce, and analyzing and excavating the preprocessed data. The method for processing big data of electric power marketing can solve the problem for storing mass electric power marketing structured and unstructured data and computing and analyzing mass data, and can fully utilize the external data, such as meteorological data and news data to analyze and excavate the big data of electric power marketing so that the requirement for intelligent marketing management and aid decision making is satisfied.