Air tightness detection device

The utility model relates to an air tightness detection device. The device comprises a gas storage tank, a standard gas storage tank and a detection clamp, the gas storage tank is connected with the standard gas storage tank through a pipeline behind the first electromagnetic valve; the air storage tank is connected with the detection clamp through the second electromagnetic valve after passing through the first electromagnetic valve and the other pipeline; an electronic flow meter is further arranged between the standard air storage tank and the detection clamp, the detection result of the electronic flow meter is input into a digital display type controller, and a qualification indicator lamp or/and an audible and visual alarm is/are further arranged on the digital display type controller. During detection, whether a to-be-detected product is qualified or not can be visually judged through a qualified indicating lamp or/and an audible and visual alarm arranged on the digital displaytype control instrument,