The invention provides a coke oven heating method and system, and belongs to the technical field of metallurgy and coking. The coke oven heating method comprises the steps that coal gas with a stable heat value is obtained from a circulating fluid bed gasification generation device; the coal gas with the stable heat value is input into a coke oven combustor. According to the coke oven heating method and system, the stability and safety of coke oven operation are improved, meanwhile, the operation cost can be saved, and the economy of a coke oven heating system is improved.