The utility model discloses a gas nozzle of a straw gasification heating furnace used for flue-cured tobacco, comprising an outer tube and an air inlet pipe and a combustion tube which are arranged through the inner part of the outer tube; an air inlet end of the air inlet pipe is fixedly connected with the outer tube by a first support plate; an air inlet passage is arranged between the outer tube and the air inlet pipe; an air outlet end of the air inlet pipe is arranged in the inner part of one end of the combustion tube and is fixedly connected with the combustion tube by a second support plate; the air inlet passage is arranged between the combustion tube and the air inlet pipe; the other end of the combustion tube positioned at the axis of the combustion tube is provided with a head cover; an interval is arranged between the head cover and the end of the combustion tube; the combustion tube is fixedly connected with the outer tube by a third support plate and the air inlet passage is arranged between the combustion tube and the outer tube. This structure of the gas nozzle leads to sufficient burning of gas; particularly the arrangement of the protruded head cover leads to better reflection effect; meanwhile, the head cover also prevents the combustion gas from damaging other components after being jetted out, thus leading the combustion heat to be dispersed quickly in all directions and achieving better heating effect.