The utility model relates to the technical field of computer cleaning and maintenance, in particular to a computer dust removal device which comprises a dust removal device body, the dust removal device body is of a hexahedron structure, an opening is formed in the top of the dust removal device body, a dust removal cavity is formed in the dust removal device body, and a power supply is arranged on one side wall of the dust removal device body. A fan and a through hole are formed in the upper surface of the movable plate, the air inlet end of the fan is connected with one end of an air inlet pipe, the air outlet end of the fan is connected with one end of an air outlet pipe, the fan is electrically connected with a power supply, and the other end of the air outlet pipe penetrates through the through hole to be inserted into the dedusting cavity; the problems that existing computer dust removal is inconvenient, in the indoor environment, dust in a case is removed through air flow sprayed out of a nozzle after a worker opens the case, the worker is completely exposed in the dust, and the operation environment is severe are solved. Or the computer is carried to an open place to be cleaned and dedusted, and the problems that the workload is increased and the efficiency is low due to back-and-forth carrying of personnel are solved.