The utility model discloses a mixing and stirring device and a mixing system. The mixing and stirring device is arranged in the mixing system. The mixing and stirring device comprises a rotating mainshaft used for being connected with a driving device and a stirring assembly used for stirring materials, and the stirring assembly comprises a first stirring shaft and a second stirring shaft. The first stirring shaft is perpendicular to and fixedly connected with the rotating main shaft, first blades are arranged at the two ends of the first stirring shaft respectively, and each first blade is of a punched plate structure provided with a plurality of through holes; the second stirring shaft is perpendicular to and fixedly connected with the rotating main shaft, and second blades of flat plate structures are arranged at the two ends of the second stirring shaft respectively. Through the mixing and stirring device and the mixing system provided by the utility model, the mixing uniformity of the product can be improved, and the mixing system can also avoid pollution caused by secondary feeding of the premix.