A heating surface of a supercritical circulating fluidized bed boiler relates to a structural design of a heating surface of a supercritical circulating fluidized bed boiler. A steam-and-water separator is added at an outlet of the conventional water wall, separated steam is delivered to a single-face heated primary superheating screen to be heated again, and then a heat absorbing section in a boiler cavity is utilized sufficiently, utilization rate of heat flow in the boiler cavity is increased, heat absorption share inside the boiler is increased, the height of the boiler cavity is reduced effectively, and cost and manufacturing cost of the supercritical circulating fluidized bed boiler are decreased. Besides, the single-face heated primary superheating screen and the water wall are arranged vertically, and the single-face heated primary superheating screen consists of two sub-screens which are arranged side by side and is heated on the single face, thereby avoiding heat transfer deterioration caused by the conventional suspended screen type superheater with double heated surfaces.