The invention discloses a linear engineering structure rapid BIM modeling method based on finite element grid division. The method comprises the steps of 1, setting a working environment; 2, inputtingthe design parameters; 3, longitudinally segmenting the structure; 4, cutting a characteristic cross section; 5, marking and drawing a control point on the longitudinal segmentation surface at the most front end; 6, marking and drawing a control point on the next longitudinal segmentation surface; 7, generating hexahedrons on the front longitudinal segmentation surface and the rear longitudinal segmentation surface; 8, generating a discontinuous component; 9, generating a structure entity; 10, carrying out model output. According to the present invention, the finite element analysis and the mesh division are considered in the parametric modeling process, the entity is established in the mode that points, lines and faces are arranged from low to high, the complex geometry with the topological association relation can be generated, the seamless combination of parametric BIM modeling and finite element analysis is achieved, and the high-quality finite element hexahedral mesh conversion is conducted. The method can be applied to all linear structures and has a wider application range.