The invention discloses an internal rib reinforced type polyethylene helical bellows. The internal rib reinforced type polyethylene helical bellows comprises a bellows body formed by strip boards through helical winding and mutual bonding, wherein each strip board comprises a substrate and a closed cavity formed in the middle of the substrate, the substrate and the closed cavity are integrally formed, and a reinforcing rib is arranged in the closed cavity; during helical winding of the strip boards, a horizontal bonding surface is formed by joint surfaces of the substrates. The internal rib reinforced type polyethylene helical bellows is simple in structure and reasonable in design, each closed cavity and the corresponding substrate are internally formed, so that the reinforcing rib structures in the closed cavities are stable and not prone to inclination and deformation, and the pressure bearing capacity and ring stiffness of the bellows are improved; left and right side surfaces of each substrate are inclined surfaces inclined in the consistent direction, accordingly, the bonding technology and process requirements are low by the aid of bonding through the inclined surfaces, machining forming is facilitated, scrappage is reduced, and production efficiency is increased.