The present disclosure relates to an adjustable air suction device, comprising a driving structure, an air suction structure, and a link structure. The driving structure and the air suction structure are disposed on a housing of an electronic device. The link structure is disposed inside the housing. Both ends of the link structure correspond to the driving structure and the air suction structure, respectively. The driving structure drives one end of the link structure to move towards a first direction, and drives the other end of the link structure to move towards a second direction. The other end of the link structure pushes the air suction structure, and projects from the housing. Besides, the air suction structure corresponds to a heat dissipating device of the electronic device and draws a great deal of fluids into the electronic device for dissipating the heat of the electronic components in the electronic device.