Abstract: Energy Internet has presently become a research focus of academic and industrial circles.As one of the key technologies,big data will play apivotal role in its development.Achievements in big data research and practice of Energy Internet at home and abroad are summarized,its concepts and characteristics enunciated,and its significance and main application domains detailed.Furthermore,challenges confronted by big data in terms of technology and management are summed up.On this basis,important application domains in Energy Internet are combed,meanwhile research framework and technology roadmap of big data are proposed.Finally,the status quo of big data research in Energy Internet is presented,its development and advancement asking for endeavors of multiple quarters.