Abstract: Starting from the common fault phenomena in the production and operation of photovoltaic power station box-type transformers, this article analyzes the fault reasons and points out the common problems in the process of box-type transformer operation management, maintenance, equipment selection, and protection configuration. It proposes effective solutions to effectively reduce design defects of photovoltaic box-type transformers and improve the operational stability of photovoltaic power station transformers. This article effectively points out the design and manufacturing defects of photovoltaic power station box-type transformers based on the on-site fault analysis of box-type transformers, which has certain guiding significance for carrying out box-type transformer fault analysis.