The invention discloses a multi-contact input method and device based on a touch screen, used for solving the technical problems of lower efficiency, complicated operation and the like when multi-point input, such as combination key input, composite key input and the like, is realized in the traditional input method based on the touch screen. According to the invention, the input by combination keys, composite keys, window zoom, rapid gesture command and the like is realized through multiple contacts, the operation habit of people is better accorded with, and the input efficiency is improved.