Aperture ratio adjustment device for air inlet of computer

The invention discloses an aperture ratio adjustment device for the air inlet of a computer. The aperture ratio adjustment device comprises a loop composed of a direct-current electromagnet and a switching device, metal shielding sheets arranged in the range of the direct-current electromagnet, a computer embedded controller configured to read the temperature value of equipment, provide a first control signal enabling the switching device to be switched on to electrify the direct-current electromagnet when the read temperature value of equipment is greater than or equal to a preset value, for the switching device, and provide a second control signal enabling the switching device to be switched off to cut off the direct-current electromagnet when the read temperature value of equipment is less than the preset value, for the switching device, and an elastic component coupled to one end of each of the metal shielding sheets, and used for generating an effect opposite to the effect of the direct-current electromagnet on the metal shielding sheets.