The invention relates to a conversion method of an architectural structure model, and is used for carrying out mutual conversion among different pieces of finite element software for the architectural structure model. The conversion method comprises the following steps: S1: converting a finite element model in the finite element software into a CAD (Computer-Aided Design) model; and S2: converting the CAD model into a target finite element model in target finite element software. Compared with the prior art, the conversion method causes a CAD file to become a transfer station used for the conversion of various pieces of finite element software. Since traditional finite element analysis software has multifarious data formats and a CAD file format has a relatively uniform standard, a pairwise-conversion combination has a huge amount among finite element software, a software interface is difficult in development, the CAD file stores unit key information, required conversion combinations can be greatly reduced through CAD conversion, and a development difficulty is lowered.