The invention discloses an exhaust pipe assembly of a six-cylinder gas engine. The exhaust pipe assembly of the six-cylinder gas engine comprises a first exhaust manifold and a second exhaust manifold, wherein the first exhaust manifold is provided with three exhaust joints, a first anti-explosion valve is arranged on the outer side wall of a main pipe body of the first exhaust manifold, and an exhaust outlet of the main pipe body of the first exhaust manifold faces one side of the six-cylinder gas engine; and the second exhaust manifold is provided with three exhaust joints, the outlet end of a main pipe body of the second exhaust manifold is connected with an exhaust pipe, the exhaust pipe extends towards one side of the six-cylinder gas engine to the exhaust outlet of the main pipe body of the first exhaust manifold, a pipe opening of the exhaust pipe and the exhaust outlet of the main pipe body of the first exhaust manifold are fixedly connected through a connecting plate, and the outer side wall of the exhaust pipe is provided with a second anti-explosion valve. The exhaust pipe assembly can ensure the operation safety of the gas engine.