A levitating bicycle hub coupling structure comprising: a shaft member mounted to a bicycle hub, having both ends connected to a bicycle frame; an internal magnet part fixed at an outer peripheral edge of the shaft member so that the inside and outside have different magnetic poles, and is integrally formed with the shaft member; an external magnet part provided at an outer peripheral edge of the internal magnet part spaced apart therefrom so as to maintain a preset distance of a gap, and the same magnetism as the outside of the internal magnet part is formed inside so that mutual friction therebetween is prevented from being generated, via the repulsive force with the internal magnet part, and having different magnetic poles inside and outside; a housing integrally formed at the outermost periphery of the external magnet part and fixed to the bicycle hub; and a bearing part corresponding to both ends of the shaft member and fitted to each thereof at both sides of the internal and external magnet parts and, wherein a central mounting hole is penetrated and formed so as to be elongated towards a lower side, for changing the mounting position of the shaft member up and down in the mounting hole and fixing the shaft member to an eccentric position from the center axis to the lower end of the housing, wherein when the position of the shaft member is lowered and fixed to a preset position in the mounting hole, the width of a lower end gap between the internal magnet part and the external magnet part is relatively narrower than the width of an upper end gap and the repulsive force applied to the shaft member becomes stronger, and the eccentric load of the shaft member which is applied and transmitted by the weight of a user when the user sits on a bicycle saddle, is supported so as not to be applied to the bearing part, thereby not coming into contact while in a levitating state and preventing the eccentric load according to the weight of the user from being transmitted to the bearing, so that the rolling performance of the bicycle hub is improved. a shaft member mounted to a bicycle hub, having both ends connected to a bicycle frame; an internal magnet part fixed at an outer peripheral edge of the shaft member so that the inside and outside have different magnetic poles, and is integrally formed with the shaft member; an external magnet part provided at an outer peripheral edge of the internal magnet part spaced apart therefrom so as to maintain a preset distance of a gap, and the same magnetism as the outside of the internal magnet part is formed inside so that mutual friction therebetween is prevented from being generated, via the repulsive force with the internal magnet part, and having different magnetic poles inside and outside; a housing integrally formed at the outermost periphery of the external magnet part and fixed to the bicycle hub; and a bearing part corresponding to both ends of the shaft member and fitted to each thereof at both sides of the internal and external magnet parts and, wherein a central mounting hole is penetrated and formed so as to be elongated towards a lower side, for changing the mounting position of the shaft member up and down in the mounting hole and fixing the shaft member to an eccentric position from the center axis to the lower end of the housing, wherein when the position of the shaft member is lowered and fixed to a preset position in the mounting hole, the width of a lower end gap between the internal magnet part and the external magnet part is relatively narrower than the width of an upper end gap and the repulsive force applied to the shaft member becomes stronger, and the eccentric load of the shaft member which is applied and transmitted by the weight of a user when the user sits on a bicycle saddle, is supported so as not to be applied to the bearing part, thereby not coming into contact while in a levitating state and preventing the eccentric load according to the weight of the user from being transmitted to the bearing, so that the rolling performance of the bicycle hub is improved.