The invention discloses an ejecting pipe and a gas combustion device. The ejecting pipe comprises a gas guide channel and an air guide channel; an airflow driving mechanism for accelerating the flowing speed of air is arranged in the air guide channel; and the airflow driving mechanism accelerates the flowing speed of the air to be directly proportional to the flowing speed of gas in the gas guide channel. Through the settings of the ejecting pipe provided by the invention, the air supply is increased along with increment of the flowing speed of the gas, so that such problems as yellow flame caused by insufficient air supply are prevented.