The SOFC system includes an efficient SOFC cell stack, a solid oxide fuel cell test system, a SOFC power generation system, and a SOFC cogeneration system. The SOFC cell stack uses fuels such as hydrogen or methane to generate electricity through electrochemical reactions, and is characterized by high efficiency and durability. The solid oxide fuel cell test system is used to evaluate the performance of the cell stack and help optimize operating parameters. The SOFC power generation system adopts a highly compact thermal balance design to achieve cascade utilization of energy and improve overall system efficiency. The SOFC cogeneration system generates electricity through natural gas and recovers waste heat to provide electricity and thermal energy, and is suitable for a variety of application scenarios.