The utility model discloses an SF6 gas leakage defect test simulation device. The SF6 gas leakage defect test simulation device comprises a pressure tank, a cover body arranged at the top of the pressure tank and an air compressor connected with the pressure tank through an inflation pipe, a pressure gauge and a thermometer are arranged on the cover body; an air leakage hole is formed in the sidewall of the pressure tank, and an emergency repair device is arranged on the pressure tank and used for simulating repair of the air leakage hole; the emergency repair device comprises a balance positioner, belts connected with the two ends of the balance positioner respectively, a screw rod penetrating through the balance positioner and connected with the balance positioner in a threaded mode, and a plugging die arranged at one end of the screw rod. A groove is formed in the end, away from the screw rod, of the plugging die. And when simulated repair operation is carried out, the emergency repair device is fixed on the pressure tank through the belt.