Internal and external rapid cooling device on thermal treatment furnace

The invention discloses an internal and external rapid cooling device on a thermal treatment furnace. When the internal and external rapid cooling device works, a fan sucks gas cooled by a cooker into an input pipeline, and thereby, the cooled gas enters an inner chamber of a furnace pipe and brings away the heat of the inner chamber of the furnace hearth; the gas is cooled by the cooler after being output from an output pipeline; then the gas enters the furnace hearth after being sucked by the fan to cool the inside of the furnace hearth; a cooling fan blows cold air to the outer surface of the furnace hearth from an air inlet to cool the outside of the furnace; and then air with the external heat of the furnace hearth is discharged out of the furnace from an air outlet to cool the outside of the furnace. The internal and external rapid cooling device cools the furnace hearth through the cooled gas, thereby having the good cooling effect, and moreover, the internal and external rapid cooling device can cool