Stirring knife assembly and stirrer

The invention belongs to the technical field of slurry stirring, and discloses a stirring cutter assembly and a stirrer, the stirring cutter assembly comprises a stirring cutter, a fixing shaft, a first rotating shaft and a refrigeration unit, the stirring cutter is provided with a cooling flow channel, the fixing shaft is provided with a water inlet hole and a water outlet hole, and the first rotating shaft is fixedly connected with the stirring cutter and used for driving the stirring cutter to rotate; the first rotating shaft is rotationally connected with the fixed shaft, a water inlet structure and a water outlet hole channel are arranged on the first rotating shaft, the refrigeration unit is used for conveying cooling liquid to the water inlet hole, and the cooling liquid sequentially passes through the water inlet hole, the water inlet structure, the cooling flow channel, the water outlet hole channel and the water outlet hole and flows back to the refrigeration unit; cooling liquid in the cooling flow