In order to obtain the ideal high-value product and recognize the contribution of various waste components to the final product, each typical single component of domestic waste was pyrolyzed separately, the volatile was reformed with half coke at 600°C, and the yield and components of the reforming gas and liquid were analyzed. The investigation was followed by the results: after reforming, the yield of the gas is the highest, reaching 66.40 wt.% of plastic air-dry weight, 119.74% higher than before reforming, the highest yield, 37.22 wt.% of kitchen waste air-dry weight, only 2.21% lower than before reforming. At the same time, after plastic pyrolysis volatile reforming, H2 production is the highest, 13.14 mol/kg of air-dry-based plastic, and the largest molar fraction in the reforming gas, 37.33 mol%. Compared with the results of single-component pyrolysis-reforming and multicomponent waste copyrolysis-reforming results, the multicomponent copyrolysis-reforming process promotes hydrolysis deoxidation, electrolyte-water vapor reforming and cracking reaction, chain hydrocarbon looping and aromatic dehydrogenation reaction, hydrogenation gasification reaction and methylation reaction, copyrolysis-reforming H2, CO2 production, and less oxygen content in the liquid.