During the swivel construction process of cable-stayed bridges， the bottom of the pylon is not fully solidified， causing a risk of overturning and collapse under wind loads. However， existing anti-overturning safety assessments mostly rely on the safety factor method， and there is limited research based on reliability. Taking a single-pylon cable-stayed bridge in Wuxi City during its swivel construction process as the research subject， the limit state equation and the design expression using partial factors for wind-induced overturning of pylons during the swivel construction process were formulated. According to static aerodynamic force coefficients obtained by virtual wind tunnel testing， the aerostatic response and buffeting response of the bridge were calculated using finite element methods， and then the internal force at the bottom of the pylon under all wind direction angles was obtained. The Monte Carlo method was employed to acquire the anti-overturning reliability index of the pylon， and results showed a minimum reliability index under the wind in the direction perpendicular to the bridge. A sensitivity analysis was conducted， revealing that the structural self-weight and wind speed have the greatest impact on the calculation results. Based on the target reliability index， the partial factors of structural self-weight and wind load in the anti-overturning calculation of the pylon were calculated using the checking point method （JC method）， serving as a reference for the swivel construction design of bridges.