The invention belongs to the technical field of information data processors, discloses a cooling device of the information data processor and is used for solving a problem of poor cooling effect of a traditional radiator since the radiator adsorbs dust in a use process. The cooling device comprises a cooling fin body in contact with a CPU (Central Processing Unit), wherein the cooling fin body is provided with cooling fins which are arranged in a rib shape; the cooling fin body is provided with a cooling fan; the lower end of the cooling fan is connected with a ventilating duct; a spiral deflector is arranged in the ventilating duct; the lower end of the ventilating duct is connected with a dedusting duct; the dedusting duct comprises an inner duct and an outer duct, wherein the upper end of the inner duct is connected into the outer duct through a connection plate, and the lower end of the inner duct is connected with the cooling fin body; the inner wall of the outer duct is provided with an annular baffle, and the lower end of the baffle is connected with the inner wall of the outer duct through a bottom plate; a collection cabin is formed among the baffle, the bottom plate and the outer duct; and a gap is formed between the baffle and the inner duct.