The invention discloses a mobile intelligent terminal-based information interaction system and a mobile intelligent terminal-based information interaction method as well as a system and a method for invoicing a tax invoice based on a mobile intelligent terminal. The information interaction system comprises the mobile intelligent terminal and a receiving terminal connected with the mobile intelligent terminal, wherein the mobile intelligent terminal comprises an input module, a display module, a first processing module used for connecting the input module and the display module, a two-dimension code output module and a two-dimension code generating module; and the receiving terminal comprises a two-dimension code identification module and an information extraction module. After the systems and the methods are adopted, the simplicity and the quickness of the information interaction process are improved, the waiting time of a client can be saved, the information interaction process is high in efficiency, and the leakage possibility of personal information with high confidentiality requirement can be greatly reduced.