The invention relates to a combustion device capable of realizing negative-pressure oil supply by using a heat recirculation ignition core. The combustion device comprises a combustion chamber; the combustion chamber is provided with a combustion cavity and an air cavity arranged at the periphery of the combustion cavity; an air hole communicating with the air cavity is formed in the wall of the combustion cavity; a flame hole is formed in the combustion cavity; a combustion core is arranged inside the combustion cavity; an oil storage basin is arranged in the combustion core; and a combustion flame core capable of entering or exiting the combustion cavity along the flame hole is arranged above the combustion core. According to the combustion device, a brand new oil supply way is designed, the combustion smoke of the combustion flame core rises in a closed space between the combustion flame core and the oil storage basin to generate negative pressure to attract the oil surface of the oil storage basin to rise and the combustion flame core to adsorb little oil to be supplied to the combustion cavity, but taking a capillary oil adsorbing material as the combustion flame core is not needed, so that the requirement of the combustion device for the quality of fuel oil is lowered; and the combustion device is particularly suitable for mineral oil such as biomass fuel oil, waste engine oil and heavy oil which are high in viscosity and flashing point and difficult to ignite and is beneficial to the popularization of the biomass fuel oil and waste edible oil to be used as fuel.