The invention puts forward an engineering construction model exportation method based on a BIM (Building Information Modeling) technology. The method comprises the following steps that: S1: selectingan engineering construction model exportation format, and a version corresponding to the engineering construction model exportation format; S2: according to the selected engineering construction model, carrying out classification in ways of Product assembling, Part and Body; S3: according to an obtained engineering construction model data organization structure and a required new model data organization structure, organizing a new required model organization structure; S4: independently filling the corresponding model attribute data obtained after the model data organization structure is classified and model graph entity B-Rep data into the corresponding engineering construction model data organization structure; and S5: according to the selected engineering construction model exportationformat and the version corresponding to the exportation format, exporting the obtained engineering construction model exportation format and engineering construction model data and graph B-Rep data oneach classification structure.