The invention provides a combustion-supporting method by activating oxygen molecules by using laser, which relates to a combustion-supporting method, and solves the problem that fuel has unstable combustion and low efficiency during the burning in the prior engine art. The method has the following implementation steps of: 1, introducing mixed gas into a quartz round tube, and igniting the mixed gas at an outlet of the quartz round tube to generate Bunsen flame, wherein the mixed gas is mixture of oxygen and other combustible gases; and 2, transmitting a laser beam to an unburnt gas area under the Bunsen flame in the step 1 by adopting a tunable dye laser to realize laser combustion supporting. The method can be widely applied to the design of aerospace engine technology.