The invention relates to a catalyst de-oiling method and a catalyst de-oiling device. The catalyst de-oiling device comprises a de-oiling tank, a gas-liquid separator, an oil gas pipeline, a circulating nitrogen compressor, a nitrogen pipeline, an oil gas water cooler, a circulating nitrogen heater and an oil gas-nitrogen gas heat exchanger, wherein a filter element is arranged in the de-oiling tank; the oil gas pipeline is led out from the bottom of the de-oiling tank and is connected in series with the oil gas-nitrogen gas heat exchanger, the oil gas water cooler and the gas-liquid separator in sequence; and the nitrogen pipeline is led out from the top of the gas-liquid separator and is connected in series with the circulating nitrogen compressor, the oil gas-nitrogen gas heat exchanger, the circulating nitrogen heater and the de-oiling tank in sequence. The nitrogen gas escaping from the gas-liquid separator is boosted by the circulating nitrogen compressor, subjected to heat exchange by the oil gas-nitrogen gas heat exchanger, heated by the circulating nitrogen heater and conveyed to the de-oiling tank, so that an oil product containing an oil catalyst is gasified into oil gas. By means of the de-oiling device provided by the invention, a catalyst de-oiling process can be finished in a short time, the de-oiling rate is up to 98.7%, and the continuous production need of a chemical engineering device is satisfied.