The invention provides an automatic cooling device of a crucible for producing semi-solid slurry. The device comprises a waste collection box, a plurality of lifting oil cylinders and crucible holders; the waste collection box is of a structure with the upper end opened, a top plate is fixed to the upper part of the waste collection box through a plurality of supporting columns vertically arranged, and an industrial fan is installed at the lower end of the top plate; one crucible holder is fixedly connected to the end of a piston rod of each lifting oil cylinder; each crucible holder comprises a placement plate, a placement groove is formed in the upper end of each placement plate and penetrates through the placement plate, and the lower end of each placement plate is fixedly connected to the end of the piston rod of each lifting oil cylinder; a tray is installed right below each placement groove; and a temperature sensor is installed at the upper end of each tray and is electrically connected to the corresponding lifting oil cylinder through a controller. According to the automatic cooling device of the crucible for producing the semi-solid slurry, the cooling degree of the crucible can be automatically monitored and can be correspondingly adjusted, and therefore the labor intensity of workers is lowered. In addition, each crucible holder is independently controlled, and therefore the waiting time is saved, and the work efficiency is improved.