The invention discloses and provides an automatic gas valve assembly line. By the adoption of the automatic gas valve assembly line, automatic assembly and detection integration of gas valves can be achieved, and the production and assembly efficiency and the detection accuracy of the gas valves are effectively improved. The automatic gas valve assembly line comprises a frame body, an assembly part and a detection part, wherein the assembly part and the detection part are arranged on the frame body. A connection conveying belt is arranged between the assembly part and the detection part. A closed-loop conveying belt is arranged in the assembly part. The assembly part comprises an inner spray nozzle assembly station, a valve core feeding station, a spring feeding station, a valve deck installation station and a screwing station. A valve body blowing-off station, a grease filling station and a grease uniform-rotation station are arranged between the inner spray nozzle assembly station and the valve core feeding station as well as between the valve core feeding station and the spring feeding station correspondingly. A spring detection station and a screw detection station are further arranged beside the screwing station. An LP spray nozzle installation station is arranged in the position of the connection conveying belt. A comprehensive detection device is arranged on the detection part.