The invention provides a dry quenching furnace. The dry quenching furnace comprises a furnace body, wherein the furnace body comprises a furnace wall and a furnace cavity; the furnace cavity is defined by the furnace wall; the furnace wall is provided with a gas passage; the gas passage comprises a first gas inlet, a gas exchange part and a first gas outlet; the first gas inlet is formed on the furnace wall, the gas exchange part is positioned in the furnace cavity, and is communicated with the furnace cavity, and then gas in the furnace cavity can enter the gas exchange part; the first gas inlet is communicated with the gas exchange part, so that the gas outside the dry quenching furnace can enter the gas exchange part via the first gas inlet, and then enter the furnace cavity via the gasexchange part; the first gas outlet is formed on the furnace wall, and is used for leading the gas led by the gas exchange part out of the furnace cavity; the dry quenching furnace also comprises a dehumidifying device, and the dehumidifying device is used for dehumidifying the gas before the gas outside the dry quenching furnace enters the furnace cavity via the gas passage. The invention also provides a coke dry quenching system. The dry quenching furnace has the advantages that the burn loss rate of coke is reduced, the productivity is increased, and the economic benefit is increased.