Cooler for computer casing

The utility model relates to a cooling device for computer cases, which is characterized in fixedly arranging a cooling fan in a cooling device casing in the same size as a disk drive and actively arranging a cold accumulation block in front of the air inlet of the fan. An air channel is provided in the cold accumulation block with one end connected with the air inlet of the fan and the other end connected with the environment. The air entering the case from the environment first passes through the air channel in the cold accumulation block and reduces the temperature via heat exchange with the cold accumulation medium in a low temperature. Then, the air after temperature reduction blows to all the components in the case. The utility model has the advantages of effectively reducing the temperature inside the computer case and preventing the system from crashing because of over high temperature.