The agitator is a new type of axial flow agitator that can be used for liquid-liquid or liquid-solid two-phase suspension mixing. The blade's arbitrary cross-section of this agitator consists of a segment of an arc and two end twisted straight edge segments. The outer edges of the two straight segments are composed of several semi-circular arc lines forming a wavy curve, and the blade extends from the tip to the root along the blade's center axis.