A method for dynamically changing a WRF mode parameterization scheme combination on the basis of a ground air pressure distribution situation, comprising: S1, constructing a database having a corresponding relation between a historical ground air pressure distribution situation and an optimal parameterization scheme combination; S2, querying a historical ground air pressure distribution situation closest to an actual rainfall forecast ground air pressure distribution situation in the database to obtain an optimal parameterization scheme combination corresponding to the historical ground air pressure distribution situation; and run a WRF mode by using the optimal parameterization scheme combination, and carrying out actual rainfall forecast. The advantages are that: the principle that the relevancy between ground air pressure distribution and weather situations is high is utilized, a ground weather situation and optimal parameterization scheme database is constructed, and the ground air pressure distribution situation at a forecast start time is taken as a basis for selecting the optimal parameterization scheme combination, so that the applicability of different parameterization scheme combinations to different weather situations can be indirectly reflected, and the forecast precision is higher and more scientific.