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1. A fully automatic device for pumping cold air into block-stone subgrade, comprising an inner cylinder configured with an air inlet and an air outlet at an upper portion and a lower portion of the inner cylinder respectively, the inner cylinder internally provided with an air pumping system comprising an air pumping impeller and a drive shaft pivotably connected inside the inner cylinder, a temperature-sensitive clutch and a driven bevel gear orderly arranged at an upper end of the drive shaft, the air pumping impeller disposed between the air inlet and the air outlet and connected to the drive shaft, the temperature-sensitive clutch comprising a lower plate and an upper plate, the lower plate and the upper plate are connected by means of a slidable structure and sliding in the same direction as an axial direction of the drive shaft, a temperature-sensitive column provided between the lower plate and the upper plate, the upper plate connected to the driven bevel gear through a movable drive shaft, a power system provided on a top of the inner cylinder and comprising an actuator, a power shaft and a driving bevel gear, the actuator connected to the power shaft for driving the power shaft to rotate, the driving bevel gear securely disposed on the power shaft, the temperature-sensitive column capable of making the driving bevel gear and the driven bevel gear engage or disengage the transmission, the slidable structure comprising two tooth grooves on a top of the lower plate and two teeth at a bottom of the upper plate, the two teeth and the two tooth grooves in one-to-one correspondence, and the teeth slidably received in the corresponding tooth grooves, with the tooth grooves open at upper ends thereof.
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