The invention discloses a heating device of a mother disc of a blue-ray CD (Compact Disc), comprising a heat-insulating cavity, a heating board and a vertical lifting mechanism. The vertical lifting mechanism comprises a fixed seat, a guide rod supporting seat, a motor, a screw, a mandril supporting seat, a bracket, two guide rods and two mandrils, wherein the fixed seat is fixed at the outer bottom of the heat-insulating cavity, one end of either mandril is fixedly connected with the mandril supporting seat, the other end of either mandril is pivotally penetrates into the heat-insulating cavity after passing through the fixed seat, the end part of each mandril is provided with a mandril head for bearing the bracket, the mother disc is borne on the bracket, one end of either guide rod is fixedly connected with the fixed seat, the other end of either guide rod is pivotally penetrates through the mandril supporting seat to be fixedly connected with the guide rod supporting seat, the motor is fixed on the guide rod supporting seat, one end of the screw is fixedly connected with the output end of the motor, the other end of the screw is fixedly connected with the mandril supporting seat, the motor drives the screw to move upwards, and the mandrils drive the bracket borne with the mother disc to make vertical lifting motion in the heat-insulating cavity along the guide rods. The heating device of the mother disc of the blue-ray CD has good heating effect and can improve the quality of a finished product.