The invention relates to a combined type self soda-returning calcining furnace body, comprising a furnace head flange, a furnace tail flange, a front rolling ring pad, a rear rolling ring pad and a gear ring pad and is characterized in that the furnace body is formed by connecting a first furnace body segment and a second furnace body segment, one end of the first furnace body segment and one endof the second furnace body segment are connected into a whole by a butt tooling; and spiral tubes head to end are arranged in the first furnace body segment and the second furnace body segment. The invention also relates to a manufacturing method of the combined type self soda-returning calcining furnace body. Comprehensive cost is greatly reduced, and problems that working ability is not enough,capacity of lifting equipment is not enough and transportation is restricted are solved. Compared with previous whole manufacture and transportation schemes, the cost can be saved by *** yuan for a 100-km load distance.