Stirring knife assembly and stirrer

The utility model belongs to the technical field of slurry stirring, and discloses a stirring knife assembly and a stirrer, the stirring knife assembly comprises a stirring knife, a fixed shaft, a first rotating shaft and a refrigeration unit, the stirring knife is provided with a cooling flow channel, the fixed shaft is provided with a water inlet hole and a water outlet hole, and the first rotating shaft is fixedly connected with the stirring knife and used for driving the stirring knife 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 cha