Abstract: China's energy structure determines that coal is the "ballast" of China's energy security. To research the efficient utilization of coal resources, this paper constructed a plate-to-plate electrode structure for plasma assisted coal combustion, where a magnetic field parallel to the direction of the electric field with a permanent magnet is generated, and studied the effect of the parallel magnetic field on the discharge power, mass attenuation and temperature change during the plasma assisted coal combustion process. The research results show that the intervention of the magnetic field can effectively enhance the number and amplitude of discharge pulse current and improve the DBD discharge power of combustion device. The magnetic field enhances the temperature and mass attenuation rate during coal combustion and accelerates the coal combustion process by increasing the discharge current and discharge power. When the peak-peak voltage increases from 16 kV to 20 kV, the promotion effect of the magnetic field on the temperature rising and mass attenuation rate of plasma assisted coal combustion gradually increases. When the peak-peak voltage reaches 22 kV, the plasma assisted coal combustion reaches the best match and the magnetic field enhancement effect reaches a saturation phenomenon. The morphology of coal combustion demonstrates that the intervention of the magnetic field can promote the plasma assisted coal combustion to a certain extent.