The invention discloses a press printer folding machine. The press printer folding machine comprises a triangular plate folding unit and a main folding unit, wherein the triangular plate folding unitis composed of a triangular plate left wallboard, a triangular plate right wallboard, a drawing roller left wallboard, a drawing roller right wallboard, a front triangular plate bottom wallboard, a middle triangular plate bottom wallboard and a rear triangular plate bottom wallboard; the main folding unit comprises a main folding front wallboard and a main folding rear wallboard; the triangular plate left wallboard and the triangular plate right wallboard are in an L shape, and the rear lower ends of the vertical parts of the triangular plate left wallboard and the triangular plate right wallboard are connected through a longitudinal support plate, and the lower end surface of the longitudinal support plate is provided with a plurality of sliders; the upper end surface of the front triangular plate bottom wallboard, the middle triangular plate bottom wallboard and the rear triangular plate bottom wallboard are respectively provided with a sliding rail; the main folding front wallboardand the main folding rear wallboard are fixed in one-to-one correspondence onto the left end surfaces of the front triangular plate bottom wallboard and the middle triangular plate bottom wallboard respectively; the upper portion of the main folding rear wallboard is provided with an air cylinder, the end of the piston rod of the air cylinder is connected with the vertical part of the triangular plate left wallboard. The press printer folding machine significantly reduce the height and is convenient to maintain.