The invention discloses a manufacturing method for an agitator cutting tool. The manufacturing method comprises the steps that step 1, a manufacturing mold of the agitator cutting tool is manufactured; step 2, a shank of the agitator cutting tool is machined and manufactured on a machine tool according to the length and the diameter of an agitator shaft; step 3, a casting material is prepared, and abrasive-resistant and shock-resistant materials are added into the casting material; step 4, the materials prepared in the last step are molten, meanwhile quenching clear water is prepared, and the shank of the agitator cutting tool is heated to 500-600 DEG C to enable the temperature difference of the shank and the casting cutting tool to gradually reduce; step 5, a part, needed to be cast on a blade, on the shank of the agitator cutting tool is put into the mold, and then molten iron is cast into the mold; step 6, a front section of the cutting tool is rapidly put into water to conduct quenching after mold releasing, wherein the length of the front section is 20 mm-25 mm; and step 7, tempering treatment is conducted. According to the agitator cutting tool manufactured by the method, manufacturing is simple, the cost is low, and the wearing-resisting property is good.