The utility model discloses a combined type boiling chlorination furnace convenient for inspection and improvement of the furnace body. A furnace body comprises a furnace top (2), a furnace body (3) and a furnace bottom (4), wherein, the furnace top (2), the furnace body (3) and the furnace bottom (4) are separately molded, and are connected through connecting pieces in sequence to form the furnace body. The furnace body (3) can also be composed of a plurality of sections of furnace bodies (3) with interchangeability, all the components are connected through flanges, and sealing elements (9) are arranged on the contact surfaces. When being repaired after damage, the furnace body can be directly replaced by a replacing component so as to reduce the stopping time; the manufacturing parameter feedback design and the design can be more quickly applied to the equipment, the height of the furnace body of the boiling chlorination furnace can be changed according to the requirements at any moment, thereby ensuring that the boiling chlorination furnace has better flexibility and adaptability, and improving the chlorination rate of the titanium-containing raw material and the use efficiency of the chlorine. The utility model has the advantages of simple structure, convenient manufacture and convenient disassembly and repair, and is mainly applied to the chlorination process of the titanium-containing raw material.