Computer case

The invention discloses a computer case which comprises a case body with a first side wall and a second side wall. The first side wall and the second side wall are oppositely arranged, the first side wall comprises a first heat dissipation position, the second side wall comprises a second heat dissipation position, and the proportion of the heat dissipation area of the ventilation heat dissipation device installed on the first heat dissipation position to the heat dissipation area of the ventilation heat dissipation device installed on the second heat dissipation position is not smaller than 2: 3. Or the proportion of the projection areas of the ventilation and heat dissipation devices mounted on the second heat dissipation position and the first heat dissipation position is not less than 2: 3; under the condition that the air flow guiding directions of the ventilation and heat dissipation devices installed on the first heat dissipation position and the second heat dissipation position are consistent, an effi