Prefabricated substation is composed of four modules, which are insulated switchgear, transformers, low voltage switch cabinet and secondary equipment, making the whole substation become a product, so it’s possible to assess the overall status of it. In this paper, an evaluation method based on information fusion is proposed. The multilayer fuzzy comprehensive evaluation method, BP neural network and grey correlation method are used to assess the four modules to get the evaluation results. Then, the DS combination rule is used to fuse the evaluation results. Finally, the fuzzy comprehensive evaluation method is used again to assess the status of the prefabricated substation based on the four modules evaluation results. Simulation results show that the proposed method can correctly evaluate the operating status of the preinstalled substation.