The utility model discloses a dampproofing dust -proof computer CPU heat dissipation fan, the radiator comprises a radiator body, the inside of radiator body is provided with the mount, and the centerof mount installs the motor, the flabellum is installed to one side of motor, the wired clamping bar of preceding surface mounting of radiator body, and be connected with wire arranging clamp on thefastener pole, fixed plate fixedly connected with cooling tube is passed through at the back of radiator body, and the one end of cooling tube installs the fin, the utility model discloses set up thefastener pole, convenient to use person installation computer machine case inner member has put a lot of electric wires on having avoided the computer mainboard, has obstructed CPU's heat dissipation,and the problem that leads to CPU to burn out has set up electrostatic precipitation board, appears the problem of computer card when having avoided the user to use the computer, has guaranteed the use comfort of computer, and CPU can and not damage by the dust accumulation simultaneously, has improved the cleanliness of computer machine incasement portion.