The invention provides a data mining method and a data mining system for big data analysis. The data mining method comprises the steps of: S1, data collection, which is implemented by acquiring a dataset for data mining from a database according to needs; S2, data processing, which is implemented by checking the integrity and consistency of each piece of data in the data set, performing denoisingprocessing, missing domain filling and invalid data deletion on each piece of data, converting the cleaned data into target data, and extracting the target data to generate preprocessed data; S3, data analysis, which is implemented by correcting a data vector according to an analysis rule, summarizing and performing multi-dimensional analysis on the corrected data to generate a data analysis result; and S4, data management, which is implemented by explaining and evaluating the data analysis result, and generating a data mining report. According to the data mining method and the data mining system, the data is collected, stored, processed and analyzed, then the analyzed data is presented to a user in the modes of characters, pictures, tables and the like, the purpose of data integration isachieved, and the data integration is rapid and visual.