The invention discloses a folded paper automatic feeding device, which comprises a machine frame, a paper feeding mechanism mounted on the machine frame, and a lifting platform which is used for bearing at least one folded paper stack (P) and controlled to approach or move away from a paper feeding position of the paper feeding mechanism. The invention also discloses a folded paper automatic feeding method which comprises: positioning at least one folded paper stack (P) on the lifting platform at an initial position far from the paper feeding mechanism; lifting the lifting platform to the paper feeding position of the paper feeding mechanism and making the paper feeding mechanism pick up the upmost piece of paper on the folded paper stack (P); and moving the lifting platform away from the paper feeding mechanism. In the invention, the folded paper stack is transported by the lifting platform, a paper twisting roll is contacted with the folded paper stack during paper feeding for picking up the upmost piece of paper on the folded paper stack; and when the folded paper is transported, the folded paper stack is separated from the paper twisting roll, and an extension space is provided for the motion of the folded paper. The device and the method of the invention also realize the automatic feeding of a plurality of folded paper stacks.