The invention relates to a volute center mold-splitting forming method and a forming tooling. The method comprises the following steps: according to the symmetric structure feature of the volute centre, independently forming symmetric parts by using a centre symmetric mold-splitting manner, and closing the shells of two parts by using a closing forming tooling; dividing the volute into a left part and a right part since the left shell and the right shell of the volute are in central symmetry and are completely the same, and forming in a set of mold so as to effectively guarantee the consistency, combining by using a round disc positioning tooling and spraying a structural adhesive so as to obtain a complete volute product, wherein the inner surface of the volute does not have a mold-closing slot, the product size stability is good, the finish is high, and the pneumatic design demand is satisfied.