The invention relates to a pen, in particular to a quick mating anti-fall pen. The quick mating anti-fall pen comprises an inner pen holder, a front pen holder, a back pen container, a return spring and a refill; in order to solve the problems of fall prevention and quick mating of a traditional pen, the quick mating anti-fall pen is provided; the quick mating anti-fall pen achieves the technicaleffect of fall prevention through refill protection achieved by automatic retraction in falling; the operating mode is optimized; the single-hand operation can be realized; the retraction and the exposure of the refill can be finished through maintenance of normal pen holding gestures; the quick mating anti-fall pen additionally achieves a writing gesture correcting function to prevent excessive approaching to a pen point; if a finger acting point excessively approaches the pen point, the refill retracts back into a pen shell, so that the pen cannot be used; the pen point needs to be exposed again; the touch of the inner pen holder is prevented; and the exposed length of the inner pen holder determines the maximum distance from the finger holding point to the pen point.