Abstract: Taking a tracking photovoltaic power generation system as the research object, Fluent software was developed twice by writing a custom program code UDF, and a two-dimensional model of single-axis tracking photovoltaic structure was established, and its torsional vibration under wind load was studied. The results show that when the wind speed reaches a certain special value, the photovoltaic panel has periodic vibration with equal amplitude and soft flutter phenomenon, and its damping ratio has a certain effect on suppressing torsional vibration, which is consistent with the actual situation. When the inclination angle of photovoltaic panel is in the range of 0°-20°, the larger the inclination angle, the lower the critical wind speed of torsional vibration.