NOVELTY - Converting dimethyl ether (DME) to hydrogen-based gas by industrial direct combustion method, comprises (i) preheating DME under reduced pressure; (ii) heating the pre-heated DME in a super-heater; (iii) transferring the heat into a reactor, disposing catalyst, and performing cracking reaction of heated gas in presence of catalyst, to obtain hydrogen-based gas; (iv) transferring the gas to a cold heat exchanger to exchange heat, and reducing temperature of gas; (v) cooling gas in the cold heat exchanger, and transferring into a gas storage tank, and directly discharging the combustion gas.    USE - The method is useful for converting dimethyl ether to hydrogen-based gas by industrial direct combustion method (claimed).    ADVANTAGE - The method converts dimethyl ether to low calorific value liquefied petroleum under the action of catalyst; and improves the effective heating rate of DME, and equally improves the calorific value of DME, and thus it achieves the energy-saving and money-saving purposes.    DETAILED DESCRIPTION - Converting dimethyl ether (DME) to hydrogen-based gas by industrial direct combustion method, comprises (i) preheating DME under reduced pressure; (ii) heating the pre-heated DME in a super-heater, where the heating temperature is 250-400 degrees C, and the pressure is 0.3-0.5 Mpa, and the heater includes multiple super-heater tubes which are sequentially connected, and two adjacent hollow connecting tubes are connected between the super-heater tubes, a spiral heating tube is set in the super-heater tube, and an electric heating pipe for carrying the DME gas; (iii) transferring the heat obtained from the heated gas into a reactor, disposing a catalyst into the reactor, carrying out cracking reaction of the heated gas under the action of catalyst, where the reaction temperature is 250-400 degrees C, and the pressure is 0.3-0.5 Mpa, and obtaining hydrogen-based gas; (iv) transferring the obtained gas into a cold heat exchanger to exchange heat, and reducing the temperature of the gas generated, where the temperature is less than 40 degrees C, and the pressure is 0.2-0.4 Mpa; (v) cooling the gas in the cold heat exchanger, and transferring into a gas storage tank, where the gas storage tank is connected with an air outlet, and directly discharging the combustion gas from the gas storage tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the super-heater.