An improved bicycle parking structure is disclosed, including a parking base having a third tubular shaft and a pair of second tubular shafts, a pair of tubular shaft jackets; featuring a first tubular shaft having a tubular space adapted for extensible and collapsible movement of a second tubular shaft, a tubular shaft jacket disposed underneath a tubular shaft opening of the first tubular shaft, wherein outer diameter of an end of the jacket is slightly larger than outer diameter of first tubular shaft, outer diameter of a connector of another end occurs to match inner diameter of tubular shaft opening. Said connector is coupled to the inner wall of the tubular shaft opening, so the second tubular shaft can be locked into an expanded portion of an end of the second tubular shaft when inserted into tubular shaft opening, to therefore effectively reduce second tubular shaft length for space conservation.