Abstract: Finite element method is a commonly used method in the numerical calculation of electric field. When the number of entities in the solving domain is large and the structure is complex, the regional discretization of the whole model is often difficult. Therefore, based on the basic geometric shape of the model, a fast method of modeling and mesh generation was proposed for the numerical analysis of the electric field of the complex model. Taking a simple two-dimensional model as an example, the paper introduced the algorithm for generation and mutual positional relationship judgment of external surround entities. Combined with the mesh generation strategy of finite element electric field calculation, the multi-layer mesh density was increased by parameterization on the surface of the model, and the efficiency and quality of the mesh generation were high. The method was applied to the calculation of electric field on the surface of ultra high voltage direct current（UHVDC） valve hall equipment. The calculation results show that the maximum error of this method is only 3.80% compared with the sub-model method, and the computational efficiency is greatly improved compared with the sub-model method. This method realizes the fine mesh control of large-scale complex models, and has a guiding significance for fast and accurate modeling of large scale finite element electric field.