NOVELTY - A domestic waste-processing device comprises a parallel connection of three fluidized beds, waste gasification device, replacement burner and metal oxide regenerator. An upper outlet of waste gasification device is connected with a first cyclone. A middle lower part of waste gasification device is connected with a return leg of second cyclone. An upper part of replacement burner is connected with second cyclone. Two sides in a middle of replacement burner are connected with a return leg of first cyclone and third cyclone, respectively.    USE - A domestic waste-processing device for zero release of domestic waste during heat treatment, and for production of hydrogen-rich combustible gas and carbon dioxide with concentration higher than 90% (claimed).    ADVANTAGE - The device and method have low cost.    DETAILED DESCRIPTION - A domestic waste-processing device comprises a parallel connection of three fluidized beds, waste gasification device, replacement burner and metal oxide regenerator. An upper outlet of waste gasification device is connected with a first cyclone. A middle lower part of waste gasification device is connected with a return leg of second cyclone. An upper part of replacement burner is connected with second cyclone. Two sides in a middle of replacement burner are connected with a return leg of first cyclone and third cyclone, respectively. A middle lower part of replacement burner is connected with metal oxide regenerator through an overflow pipe. An upper outlet of metal oxide regenerator is connected with third cyclone. A gas separator is connected with first cyclone and replacement burner through first pipeline and second pipeline, respectively. A gas outlet of second cyclone is connected with a condenser. A gas outlet of third cyclone is connected with a waste heat utilization unit or emptying device. An INDEPENDENT CLAIM is included for a process for zero release of domestic waste during heat treatment for production of hydrogen-rich combustible gas and carbon dioxide with concentration higher than 90%, comprising using domestic waste and using air or water vapor as fluidizing agent.