The invention discloses a comburent for 
microwave treatment of 
waste gas and a 
combustion method and 
combustion device thereof. The comburent is prepared from water, a wave absorbing substance, firstsupporting particles, second supporting particles and an aqueous binder. The 
combustion device comprises a shell, a 
microwave unit and a 
flange. The comburent and the combustion method and combustiondevice thereof have the advantages that the comburent which is prepared from the water, the wave-absorbing substance, the first supporting particles, the second supporting particles and the aqueous binder is adopted to absorb microwaves, with the cooperation of the combustion method and the combustion device, a heat source is provided for the 
waste gas treatment process in a mode of converting 
microwave energy into 
heat energy inside the comburent, so that the 
heat transfer rate is higher, the heating speed is high, the heat loss is small, the operation is convenient, no sharp corner exists inthe shell of the combustion device, with the cooperation of a ventilation reflection plate and the conical 
flange, the microwaves are reflected into the shell to uniformly act on the comburent, so that the 
energy loss is reduced, the heat conversion rate of the comburent is increased, and an outer 
thermal insulation plate, a 
wave absorption coating and an inner 
thermal insulation plate are arranged, so that the safety of combustion treatment of the 
waste gas is improved.