Method for recovering relief gas in process for examining and repairing gas pipe network and device thereof

The invention discloses a recovery device for leaked gas in the maintaining operation process of gas pipe network, comprising a pressure device provided with a gas inlet and a gas outlet, a gas inlet pipeline, a gas outlet pipeline, a maintaining side pipeline, an operation side pipeline, an inert gas bomb and an air inlet; wherein the maintaining side pipeline and gas inlet pipeline are connected by a control valve (81); the operation side pipeline and gas outlet pipeline are connected by a control valve (82); the other sides of the maintaining side pipeline and operation side pipeline are respectively connected with a hose tube; the maintaining side pipeline and gas outlet pipeline are connected by a control valve (83); the operation side pipeline and gas inlet pipeline are connected bya control valve (84); the inert gas bomb is connected with the maintaining side pipeline by a control valve; and the air inlet is connected with the gas inlet pipeline by a control valve. The recovery device recycles and uses