The invention provides a coke dry quenching device. The device is provided with a coke quenching tower, a blowing-in device, a waste heat boiler, an SF air blowing-in device and a bypass pipe, wherein the coke quenching tower is composed of a cooling chamber and a fore-chamber arranged on the upper part of the cooling chamber; the blowing-in device is used for blowing air and/or water or steam into the fore-chamber; the waste heat boiler is used for carrying out heat exchange with red-hot coke in the cooling chamber to recover sensible heat of high-temperature gas discharged from the coke quenching tower; the SF air blowing-in device is used for supplying air to the high-temperature gas discharged from the coke quenching tower; and the bypass pipe is used for shunting a part of gas which is discharged from the waste heat boiler and supplied to the cooling chamber as a noble gas so that the shunted gas and the gas supplied by the waste heat boiler are combined, wherein in the route for discharging the high-temperature gas from the coke quenching tower and guiding into the waste heat boiler, and the combination position of the bypass pipe is located at the upstream side (opposite to the boiler) higher than an SF air bowing-in port. Thus, by using the coke dry quenching device, the steam recovery amount can be constantly maintained, and the contents of a combustible gas component and an oxygen component in the recycled gas are maintained to the minimum, foreign matters can be prevented from being adhered, and the heat damage of a boiler pipe can be avoided.