The invention relates to a complex fertilizer cooling device, which comprises a cooling tower, an elevator, a belt conveyor, a buried scraper conveyor, a cloth bag deduster, an exhaust fan and a blower, the complex fertilizer cooling device further comprises a cooling device comprising a vertical material pipe, an air exhaust pipe, a blowing pipe and a spiral guide plate, wherein one end of the air exhaust pipe is located in the material pipe, and the spiral guide plate is disposed in the material pipe; a water outlet end of the cooling tower is connected to a water inlet joint through an inlet pipe, the water inlet end of the cooling tower is connected to the water outlet joint through a drain pipe, and a circulating water pump is installed on the inlet pipe; the belt conveyor is horizontally disposed under the material pipe, and the elevator and the buried scraper conveyor are respectively connected to two sides of the belt conveyor, the buried scraper conveyor is used to transport afertilizer conveyed by the belt conveyor to a designated place, and the elevator is used to return the fertilizer conveyed by the belt conveyor to a feed hopper.