A cooling device, comprising: a converter cooling circuit, in which a converter radiator is arranged; a fuel cell cooling circuit, in which a fuel cell radiator is arranged; and an air-cooling assembly configured to perform heat dissipation and cooling for the converter radiator and the fuel cell radiator, wherein the converter cooling circuit is configured to dissipate heat for a converter, and the fuel cell cooling circuit is configured to dissipate heat for a fuel cell; wherein in a transverse direction, the converter radiator is located at a first side of the fuel cell radiator and in parallel therewith, while the air-cooling assembly is located at a second side of the fuel cell radiator, wherein the converter radiator and the fuel cell radiator being partially overlapped with each other in the transverse direction; wherein in a longitudinal direction, the converter radiator is located at a second end of the fuel cell radiator, so that ambient air is sucked in from a first side of the converter radiator at a position corresponding to the converter radiator, and then drawn out by the air-cooling assembly after passing through the fuel cell radiator; wherein in the transverse direction, the converter radiator and the fuel cell radiator are spaced from each other so that a cylindrical air duct body is arranged between the converter radiator and the fuel cell radiator and in communication with both; and a cleaning port is formed in an upper surface of the air duct body, and a cleaning cover is arranged at the cleaning port via a hinge; and wherein the upper surface of the air duct body is configured as an inclined surface, which has a first side and a second side higher than the first side. a converter cooling circuit, in which a converter radiator is arranged; a fuel cell cooling circuit, in which a fuel cell radiator is arranged; and an air-cooling assembly configured to perform heat dissipation and cooling for the converter radiator and the fuel cell radiator, wherein the converter cooling circuit is configured to dissipate heat for a converter, and the fuel cell cooling circuit is configured to dissipate heat for a fuel cell; wherein in a transverse direction, the converter radiator is located at a first side of the fuel cell radiator and in parallel therewith, while the air-cooling assembly is located at a second side of the fuel cell radiator, wherein the converter radiator and the fuel cell radiator being partially overlapped with each other in the transverse direction; wherein in a longitudinal direction, the converter radiator is located at a second end of the fuel cell radiator, so that ambient air is sucked in from a first side of the converter radiator at a position corresponding to the converter radiator, and then drawn out by the air-cooling assembly after passing through the fuel cell radiator; wherein in the transverse direction, the converter radiator and the fuel cell radiator are spaced from each other so that a cylindrical air duct body is arranged between the converter radiator and the fuel cell radiator and in communication with both; and a cleaning port is formed in an upper surface of the air duct body, and a cleaning cover is arranged at the cleaning port via a hinge; and wherein the upper surface of the air duct body is configured as an inclined surface, which has a first side and a second side higher than the first side.