The use of sliding bearings instead of rolling bearings in wind power gearboxes is the mainstream trend in future development.However,due to the complex and variable service conditions,the lubrication law of wind turbine sliding bearings is still needs further research.The lubrication analysis model of sliding bearings of wind power gearboxes was established,the lubrication state of sliding bearings under various working conditions was simulated and analyzed,and the empirical formula of the minimum film thickness of the sliding bearings was fitted.Combined with the lubrication reliability theory,the lubrication reliability model was established based on the minimum film thickness formula,and this model was used to study the lubrication performance of gearbox sliding bearings of fans under starting and stopping conditions of the fan.A lubrication reliability analysis method for sliding bearings of wind power gearbox was proposed,and the lubrication reliability of the gearbox sliding bearing was analyzed.The results show that the minimum film thickness of the bearing during the startup process increases rapidly at first,and then decreases rapidly until it is stable,while the minimum film thickness decreases rapidly during shutdown.The lubrication failure time of sliding bearing in shutdown condition is longer than that in start-up condition.The direction of external load has a significant impact on the probability of lubrication failure during start-up conditions,but has a relatively small impact on shutdown conditions.