Fast-folding structure of folding bicycle

The utility model relates to a quickly foldaway structure of foldable bicycle. The upper and lower support rods of the foldaway structure are made up of equilateral edge tube. One side of the lower folding plate is provided with eyelet. On one side of the upper folding, a column-type flexible pin is arranged vertically corresponding with the upper folding plate. On the lower profile of the flexible pin, a pinhole is positioned horizontally. A flexible pin with spring is arranged inside the pinhole in a cross sliding fit. A tension spring is arranged between the middle part of the flexible pin and the upper folding plate, the function of which is to provide a constant upward elastic force for the pin and help the folding and extension of the upper and the lower support rods. The foldaway structure can be easily folded and extended, and labor-saving which can be done freely by common women and children. Cars equipped with the structure are suitable for more crowds, providing great convenience to the users thereby having a great practical value of generalization.