The invention discloses a method and a system for mixed use of a virtual real person during live video broadcasting, and belongs to the technical field of virtual live broadcasting. The method comprises the following steps of problem library establishment, live broadcast, virtual real-person live broadcast, virtual real-person interaction, problem library data matching, problem library data amplification and problem library data re-matching. According to the invention, the virtual real person is used in a mixed manner during live video broadcasting, so that the problem that broadcasting cannotbe started around the clock due to long online broadcasting starting time and large workload of broadcasting personnel is solved, and a time-saving and labor-saving live broadcasting mode is achieved; through data matching of the question bank, the server selects the answer video corresponding to the question to play, questions of most users are satisfied, and a live broadcast effect of one-to-hundred and efficient interactive propagation is realized. Through question bank data amplification, question bank data re-matching and video synthesis, questions of all users are asked, the user experience is improved, and the live broadcast effect is improved.