The invention discloses a folding plate mechanism. The folding plate mechanism comprises an eight-hole plate (A1), two first six-hole plates (A2), two first four-hole plates (A3), two second six-hole plates (A4), two second four-hole plates (A5), four uniaxial hinges (B1), two long-distance biaxial hinges (B2), two short-distance biaxial hinges (B3), and four sliding hinges (B4). The eight plates are arranged to be a plane according to a certain sequence; the adjacent plates are connected by the corresponding hinges. The folding plates can be folded according to a certain movement sequence manually or in a manner of adding drives; after being folded, the area of the plates is about one ninth of the area of the plates when being fully expanded. The folding plates are easy to carry, store and transport; the folding manner is flexible and simple to operate; the folding plate can be used for manufacturing teaching aids, handiworks, outdoor camping equipment, clothes drying plates, solar cell panels and the like and can also be used in military or aerospace industries.