The invention discloses a quick-open adjustable air-tight door, relates to the technical field of cement equipment, in particular to a structure of an air-tight door, which comprises a bottom frame and a door closure, wherein sealing strips are arranged between the bottom frame and the door closure; two ears are connected with the bottom frame; two beams are arranged on the outer side of the door closure; two ends of each beam are respectively penetrated through the corresponding ears; the middle part of each beam is in threaded connection with a jackscrew; and the inner end of each jackscrew is in contact with the door closure. The sealing strips are arranged between the bottom frame and the door closure; by adjusting the jackscrews, as the jackscrews prop against the door closure and the sealing strips, the sealing effect and the sealing pressure can be adjusted; and the whole assembly structure of the air-tight door of the cement equipment is stable and reliable.