Building material purchasing method and system

The invention discloses a building material purchasing method and system, and belongs to the technical field of building material purchasing, the building material purchasing method comprises the following steps: obtaining building demands, analyzing and sorting the building demands, creating a to-be-constructed project, modeling the to-be-constructed project, and obtaining a visual building model; performing layering processing on the visual building model, performing material consumption evaluation on the layered building model, collecting multiple groups of data of the same type, performing analogy processing, and obtaining a material consumption mean value of different building models after layering; setting a model-material purchasing ratio of different building models according to the mean value, calculating the material purchasing quantity according to the building models and building requirements, and summarizing the material purchasing quantity. The method solves the problem that the progress of a bu