The invention relates to detection equipment of air tightness of a shell. The invention adopts a technical scheme that: the cylinder body of a lower oil cylinder is fixed on a bottom frame of a steel framework; a piston rod of the lower oil cylinder is upwards connected to a water tank; a lower guide component is arranged between the water tank and the bottom frame of the steel framework; liftingrollers are arranged on two sides of the water tank respectively and are embedded in channel steels of upright posts of the steel framework; a pressure-bearing hanging table is suspended on the steelframework; a moving table mechanism is born on the pressure-bearing hanging table through a roller support arranged on a bottom lifting part; an elastic pressing frame mechanism is arranged over the moving table mechanism; the cylinder body of an upper oil cylinder is fixed on a top frame of the steel framework; a piston rod of the upper oil cylinder is downwards connected to the elastic pressingframe mechanism; an upper guide component is arranged between the elastic pressing frame mechanism and the top frame of the steel framework; a push oil cylinder is horizontally arranged; the cylinderbody of the push oil cylinder is fixed on the steel framework; and the piston rod of the push oil cylinder is connected with the moving table mechanism. The detection equipment of the invention has the advantages of craft and reasonable structure, strong reliability, cost saving, good university and good sealing effect.