The utility model discloses an emergency cooling device for a spent fuel pool of a nuclear power plant. The emergency cooling device comprises a generator set, a circulating cooling pump and an air cooler which are arranged on the same mobile carrying platform, the generator set is connected with the circulating cooling pump and the air cooler through power supply cables; the cooling system is used for providing power for the circulating cooling pump and the air cooler, an inlet of the circulating cooling pump is connected with a water intake of an original cooling system of the spent fuel pool through a water diversion pipeline, an outlet of the circulating cooling pump is connected with an inlet of the air cooler through a connecting pipeline, and an outlet of the air cooler conveys cooled pool water to the spent fuel pool through a water return pipeline; when an original cooling system of the spent fuel pool breaks down, the generator set drives the circulating cooling pump and theair cooler to work, the circulating cooling pump conveys introduced pool water of the spent fuel pool to the air cooler through the connecting pipeline to be cooled, and the air cooler cools the poolwater and then conveys the pool water back to the spent fuel pool. Compared with the prior art, the emergency cooling device does not need to spray water for cooling.