Folding structure of a flier

A folding structure of a flier comprising a stretched fuselage extending from front side to rear side, the fuselage integrally having a nose, a folding section adjoining with the nose, a wing section adjoining with the folding section and a tail adjoining with the wing section, a center of the fuselage being formed with a first folding line which longitudinally extends from the nose to the tail between symmetrical left and right halves of the fuselage, the nose and the folding section adjoining with each other along a second folding line, the wing section and the folding section adjoining with each other along a third folding line, a rear edge of the folding section being connected with the nose, whereby after folded about the second folding line and third folding line, both the nose and the wing section partially overlap the folding section, a front edge of the folding section being connected with the wing section, whereby the folding section and the wing section can be stretched to form a flow-guiding space, the nose being inward many times folded and having heavier weight.