The invention discloses a two/three-dimensional data integration method and system. The method comprises the following steps: analyzing a two-dimensional drawing to obtain design data in the drawing; transforming coordinates of the design data to a unified coordinate system to obtain two-dimensional coordinate data; converting three-dimensional models into model components in a unified format; transforming model component data coordinates to the unified coordinate system to obtain three-dimensional coordinate data; and according to the two-dimensional coordinate data and the three-dimensional coordinate data, carrying out model data integration on the design data and the model component data based on the unified coordinate system. The system and method, on the basis of combination of the two-dimensional drawing and the three-dimensional digital model, enable the two-dimensional drawing and the three-dimensional models to be integrated to the same platform after being converted based on the unified coordinate system.