Microcomputer

The invention discloses a microcomputer which comprises a power source and a shell, the shell defines an installation space and is provided with an air inlet and an air outlet, and the power source is installed in the shell; the computer mainboard is provided with a central processing unit; the heat conduction piece is connected between the central processing unit and the radiator, the radiator is suitable for driving airflow to flow from the air inlet to the air outlet, the radiator is located between the air inlet and the air outlet, and the computer mainboard, the radiator and the radiator fan are arranged in the radial direction of the microcomputer. Therefore, by arranging the computer mainboard, the radiator and the cooling fan in the radial direction of the microcomputer, the height size of the space needed for installing the computer mainboard, the radiator and the cooling fan can be reduced, and compared with the prior art, the thickness size of the microcomputer can be correspondingly reduced; there