The utility model discloses a non -maintaining coupling device of large -scale aerogenerator pylon, include: an in the bolt hookup combination for bearing the connector of the transverse load that various vibration combined action arouse the fan pylon down among the overturning moment of wind and the fan operation, this connector sets up in the fan pylon. the utility model has the advantages that: easy and simple to handle, it can eliminate the clearance between attachment bolt and the bolt pore wall totally to form certain magnitude of interference. Simultaneously, produced huge packing force between attachment bolt and bolt pore wall, realized reliably linking to this bears the transverse load. Simultaneously, making installation cost and showing and reduce, be applied to and formed the connection between the pylon flange, do not have any relative displacement between the pylon flange, it becomes a whole with two mating flange riveting to be equal to. Like this, the overturning moment of dead load that the pylon received, dynamic loading, wind and various vibration can not cause that the hookup is not hard up, and fundamentally solves the bolt looseness problem, in 20 years fan continuous use life -spans, need not the pair -bonding bolt and checks the maintenance.