A cooling apparatus for cooling a device, wherein the cooling apparatus comprises: a cabinet body configured to contain a cooling medium for at least partially immersing the device; a first volumeter for detecting a volume of the cooling medium in the cabinet body; and a replenishing device coupled to the cabinet body and comprising a storage tank (70, 210) storing the cooling medium; a driving device for driving the cooling medium between the storage tank (70, 210) and the cabinet body; wherein: when the first volumeter detects that the volume of the cooling medium in the cabinet body is lower than a first preset volume, then a connection between the storage tank (70, 210) and the cabinet body is opened and the driving device drives the cooling medium in the storage tank into the cabinet body; characterized in that when the first volumeter detects that the volume of the cooling medium in the cabinet body reaches a second preset volume, then the connection between the storage tank (70, 210) and the cabinet body is closed and the driving device stops driving the cooling medium into the cabinet body, wherein the second preset volume is higher than the first preset volume; and wherein: when the first volumeter detects that the volume of the cooling medium in the cabinet body exceeds a second preset volume, then a connection between the storage tank and the cabinet body is opened and the driving device drives the cooling medium in the cabinet body into the storage tank (70, 210); and when the first volumeter detects that the volume of the cooling medium in the cabinet body is restored to the second preset volume, then the connection between the storage tank and the cabinet body is closed and the driving device stops driving the cooling medium into the storage tank. a cabinet body configured to contain a cooling medium for at least partially immersing the device; a first volumeter for detecting a volume of the cooling medium in the cabinet body; and a replenishing device coupled to the cabinet body and comprising a storage tank (70, 210) storing the cooling medium; a driving device for driving the cooling medium between the storage tank (70, 210) and the cabinet body; wherein: when the first volumeter detects that the volume of the cooling medium in the cabinet body is lower than a first preset volume, then a connection between the storage tank (70, 210) and the cabinet body is opened and the driving device drives the cooling medium in the storage tank into the cabinet body; characterized in that when the first volumeter detects that the volume of the cooling medium in the cabinet body reaches a second preset volume, then the connection between the storage tank (70, 210) and the cabinet body is closed and the driving device stops driving the cooling medium into the cabinet body, wherein the second preset volume is higher than the first preset volume; and wherein: when the first volumeter detects that the volume of the cooling medium in the cabinet body exceeds a second preset volume, then a connection between the storage tank and the cabinet body is opened and the driving device drives the cooling medium in the cabinet body into the storage tank (70, 210); and when the first volumeter detects that the volume of the cooling medium in the cabinet body is restored to the second preset volume, then the connection between the storage tank and the cabinet body is closed and the driving device stops driving the cooling medium into the storage tank.