The invention discloses an adjustable double cover body double-pressing-type pressure vessel. The adjustable double cover body double-pressing-type pressure vessel comprises a tank body, a tank cover, a movable bracket adjustable in height and an adjustable type pressing device, wherein the tank cover is installed on the tank body, and the adjustable type pressing device is installed on the movable bracket. An upper circular ring installation plate and a lower circular ring installation plate are arranged at the joint of the tank cover and the tank body, and the tank cover is further provided with a hydraulic opening. The hydraulic opening is provided with a detachable hydraulic cover. According to the adjustable double cover body double-pressing-type pressure vessel, the closing mode of two door covers is also of a pressing type, door slots between the two door covers can be all pressed and blocked through long-strip pressing plates installed on a second hydraulic cylinder, and in this way, opening and closing of the door covers are very convenient; moreover, each long-strip pressing plate is provided with a sealing rubber pad, after the door slots are pressed through the sealing rubber pads, the sealing performance can be improved, and pressure leakage is prevented; and in addition, clamping blocks arranged on the long-strip pressing plates are pressed into clamping grooves in the door covers during pressing, not only can positioning be conducted, but also the stability can be reinforced, the impact resistance is improved, and the situation that the door covers are opened due to excessive pressure or accidental causes is prevented.