The invention provides power line live line working device based on mixed reality. The power line live line work device comprises a front-end sensing module, a three-dimensional gesture somatosensorymodule, an immersion type operation module, an unmanned work module, a ground station and a cloud server. The front-end sensing module collects equipment space information and external environment information of a power line. The three-dimensional gesture somatosensory module is used for acquiring hand maintenance operation actions of remote electric power maintenance personnel. The cloud server is used for analyzing and processing the acquired equipment space information, the external environment information and the hand actions of the remote electric power overhaul personnel, and generatinga mixed reality environment data model and mechanical action information. The immersion type operation module calls the mixed reality environment data model. The unmanned operation module receives themechanical action information issued by the cloud server. According to the method and the equipment, unmanned or remote live-line work of the power line is realized, and effective technical support is provided for unmanned/remote live-line work of the power line.