The invention provides device for diversion of quenching exhaust gas and diversion method, exhaust gas chamber is located at top of quenching chamber; quenching chamber is fixedly connected to exhaust gas chamber through partition; support plate in lifting assembly is fixedly connected to side of partition, motor in exhaust assembly is fixedly connected to slider in lifting assembly, two adjacent sides of quenching chamber are fixedly connected to lower surface of support plate through triangular support frame; sealing brushes are located on two adjacent sides of exhaust chamber, gas detector is located inside exhaust chamber on one side near the top, exhaust cylinder is located at center of upper surface of top of exhaust chamber, first end of slider support column and motor support seat are respectively located on upper surface of support plate, second end is fixedly connected with lower surface of baffle through cylindrical hole of slider.