The invention relates to a numerical value simulation and numerical value calculation method for an overall process of debris flow. By researching on a debris flow formation process and mechanism, debris flow channel material starting, and a debris flow movement accumulating process numerical value calculation method, and by constructing a debris flow dynamic process and an engineering regulation and control numerical value simulation platform at the same time, the scientificity and reliability of the research on the dynamic process of the debris flow can be improved, so that technological support is supplied for debris flow disaster alleviation and better service is supplied for the debris flow disaster alleviation; dynamic characteristic of debris flow slurry and big stones are taken into full consideration in a proposed debris flow movement model; a concept of interchange rate of materials of debris flow and a movable bed is introduced initially; and corrosion of debris flow along the way and disaster scale change are taken into consideration to form the debris flow formation-movement-accumulation numerical value simulation and numerical value calculation method based on the overall process. By adoption of the numerical value simulation and numerical value calculation method, the scientificity and reliability of the research on the dynamic process of the debris flow can be improved, so that technological support is supplied for debris flow disaster alleviation and better service is supplied for the debris flow disaster alleviation.