A coal-firing oil heating furnace, wherein its hearth is in the furnace shell, and the intracavity of the hearth is separated from the intracavity of the furnace shell. The lower ends of the fire-tubes are communicated with the hearth, and the upper ends of the fire-tubes are communicated with the flue. There is an oil jacket containing the heat-transferring oil between the outer surface of the hearth and the inner surface of the furnace shell. The jacket is divided into several units by baffle plates, and the heat-transferring oil is forced circulating through each unit by an inner circulating pump, further an outer circulating pump is used to send the heat-transferring oil to the service position and takes it back. The invention can reduce the heating cost of the heat-transferring oil greatly and can avoid the oil being heated to be carbonization or coking. The invention can be applied to the circulating and heating of the heat-transferring oil in the industry of rubber, shoes material, textiles, dye printing, chemical engineering.
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