The invention relates to a power load forecasting method based on a big data technology, and a research and application system based on the method. Supported by the big data technology, various kinds of mature open-source products are integrated, and a power load forecasting method including data source, data integration, data storage, data calculation, data analysis, power load characteristic analysis and power load forecasting analysis implementation is formed. The power load forecasting method effectively improves high efficiency of massive data processing, solves the limitation of the traditional statistical analysis hypothetical judgment, can forecast electricity utilization demands in future scientifically and precisely, is conductive to peak load shifting and stabilized operation of a power grid, and offers decision-making support for power grid planning, equipment overhauling, electric energy deployment and the like of the company.