The invention discloses a paper-plastic ring cutting machine. The paper-plastic ring cutting machine comprises a marble platform, a portal frame made of marble, a control mechanism and an air blowingmechanism, wherein a first transmission mechanism for driving a bearing table to move back and forth along a first linear track is arranged on the marble platform, and a jig for placing a product to be cut is mounted on the bearing table; a second transmission mechanism for driving a Z-axis movement module to move back and forth along a second linear track is arranged on the portal frame, and thefirst linear track is perpendicular to the second linear track in different planes; the Z-axis movement module can drive a cutting mechanism to move up and down; the first transmission mechanism and the second transmission mechanism are driven by a linear motor; the control mechanism is connected with the first transmission mechanism, the second transmission mechanism and the Z-axis movement module; and the air blowing mechanism is used for cooling a blade of a cutter on the cutting mechanism. The marble platform and the portal frame structure are high in surface flatness precision, and the flatness of the product section is improved; and the linear motor form is adopted, friction is avoided, energy consumption is low, movement is stable, the speed is high, and the section quality is guaranteed.