The high working temperature of solid oxide fuel cell (SOFC) leads to great thermal stress in actual operation, which eventually leads to the fracture of the structure.??Therefore, it is necessary to study the thermal stress of SOFC.??In this paper, a corrugated SOFC 3d model was constructed, coupling electrochemical reaction, gas flow and diffusion, multi-material transfer, temperature field and mechanical field, and the influence of flow form and Angle of different flow channels on the thermal stress in the battery was studied.??The results show that the distribution of temperature and thermal stress is not uniform under different voltages.??The temperature gradient caused by the downstream electrochemical reaction and heat transfer process is greater than that caused by the upstream process, resulting in higher thermal stress.??The abrupt change point of thermal stress is mainly located at the Angle between interconnection, electrode plate and flow channel.??In addition, as the flow channel Angle decreases, the stress value decreases, which greatly reduces the thermal stress level in SOFC.