Composite channel injection backflow pre-mixing type liquid/gas phase alcohol-based burner

The utility model discloses a composite channel injection backflow premixing type liquid/gas phase alcohol-based burner which comprises a first combustion chamber and a second combustion chamber, an injection premixing lower burner is arranged in the second combustion chamber, an injection premixing upper burner is arranged in the first combustion chamber, and an up-down adjusting distribution air bellow is connected between the first combustion chamber and the second combustion chamber. The lower injection premixing burner comprises a nozzle and a divergent nozzle, the inlet end of the divergent nozzle is connected with a low-NOx nozzle, and a first liquid-phase combustion atomization spray gun and a first flame stabilizing impeller are arranged in the center of the divergent nozzle; the burner can burn in a liquid state, a gas state or a liquid-gas mixed combustion mode; the alcohol-based vaporization device can automatically supply heat, and waste heat is recycled; the composite nozzle adopting the rotatio