Library virtual space is a kind of library innovation service space constructed by the library comprehensive application of a new generation of information technology in recent years, which has become a new choice for readers' digital reading, and already had some construction practice at home and abroad. Library virtual space is composed of scene space, fictional space and social space, which has some differences with traditional library digital space and library physical space in service orientation, service mode and service effect. Human-computer interaction technology will be widely used in the construction and service of library virtual space in the future.