The utility model relates to a building heating device, in particular to a pre-buried double-heat type building heating system which comprises hot water pipelines, electrothermal conducting wires, a cement floor, an insulation layer and a floor, wherein the insulation layer is laid on the cement floor; an insulation ceramic pipe is packed outside each electrothermal conducting wire; the electrothermal conducting wires and the hot water pipelines are parallelly laid on the insulation layer; and the floor is covered on both the electrothermal conducting wires and the hot water pipelines. The building heating system adopting the structure rather than a single geothermal structure, is not obviously increased in cost and is suitable for popularization.