▎ 摘　　要

NOVELTY - The utility model claims a heating tube for baking cooking appliance, comprising a heating sheet for generating radiation heat source and a transparent tube for radiating heat source to penetrate, the heating sheet is set in the transparent tube, the heating sheet comprises a sheet-shaped graphite main body, the graphite main body comprises a first plane and a second plane set oppositely; the heating sheet further comprises a pyrolytic graphite layer set on the first plane and/or the second plane, the graphite main body is combined with the pyrolytic graphite layer so that the heating sheet generates graphene heating effect. by setting pyrolytic graphite layer on the graphite main body, so that the heating sheet under the condition of ensuring flexible, increasing the surface hardness, reaching the balance of heating sheet flexibility and hardness, preventing the heating sheet assembly, breaking or twisting in the transportation process, improving the strength of the heating sheet. at the same time, the graphite main body and the pyrolytic graphite layer are combined to generate graphene heating effect, so that the heating sheet generates bunched far infrared radiation when heating, so that the heating sheet obtains excellent conductive performance, thermal performance and optical performance.