Semisolid metal slurry preparation device and method

The invention discloses a semisolid metal slurry preparation device and method. The semisolid metal slurry preparation device comprises an air supplying device body, an air guiding pipe, a stirring rod and a bearing container used for containing a metal melt. The end, stretching into the metal melt in the bearing container, of the stirring rod is a stirring end. The stirring end is internally provided with a cavity. The air supplying device body is used for injecting cooling gas into the cavity inside the stirring end through the air guiding pipe when the metal melt is stirred by the stirring rod, and a processing mode of cooling and stirring is formed, so that in the stirring and flowing processes of the metal melt, the internal temperature field is uniformly distributed basically, obvious too cold gradients are avoided, the dendritic crystal growth environment is destroyed, and thus semisolid slurry with a certain proportion of near-spheroidal primary solid phase uniformly distributed in a liquid phase matr