The invention discloses a heating device for a laminator. The heating device comprises a shell, wherein three layers of heating tubes are arranged in the shell in parallel; the heating tubes on a toplayer and the heating tubes on a bottom layer are arranged symmetrically; the heating tubes on a middle layer and the heating tubes on the two sides are arranged in a staggered manner; a temperature sensor is arranged between two adjacent heating tubes on the middle layer; the shell is filled with a heat-conduction silica gel layer; an arc-shaped groove is formed at a position in the heat-conduction silica gel layer between the heating tubes on the top layer and the heating tubes on the bottom layer; the heating tubes on the top layer and the heating tubes on the bottom layer are positioned inthe arc-shaped groove; the heating tubes comprise outer sleeves and inner sleeves which are arranged concentrically; heat conduction oil is filled between the outer sleeves and the inner sleeves; electric heating wires are arranged inside the inner sleeves. The invention further discloses a control method of the heating device for the laminator. By adopting the heating device, the defects in theprior art can be overcome, and the temperature difference of the heating device for the laminator is further reduced.