Relay protector cooling device

The invention relates to a relay protector cooling device. The relay protector cooling device comprises a rectangular parallelepiped casing (1), and a detachable protective cover (20) is mounted on one side of the casing (1), an air-inlet grille (15) and an air-outlet grille (16) are respectively arranged at the two opposite sides of the casing (1) beside the protective cover (20), the air-inlet grille (15) is provided with an air inlet fan (12), the air-outlet grille (16) is provided with an air outlet fan (13), a heat conducting plate (3) is fixedly mounted inside the casing (1), and a liquid cooling radiator is fixedly mounted in the casing (1) on the side of the heat conducting plate (3), and the heat exchange unit of the liquid cooling radiator is in tight contact with the heat conducting plate (3). Through arrangement of the air inlet fan, the air outlet fan, the air-inlet grille and the air-outlet grille, the relay protector cooling device can form convected air in the casing soas to achieve the purpos