The treatment process of low-temperature pyrolysis may efficiently utilize solid wastes, including plastics, pine wood, and sludge. This study used a hot-press molding device to treat sludge, plastics, and pine wood to low-temperature pyrolysis. Then, the combustion characteristics of the molded fuels were examined using thermogravimetric, elemental, and industrial analyses at various raw material ratios, pyrolysis temperature, and pyrolysis times. According to the results, the molded fuel with a ratio of 75:15:10 had the best combustion performance, with an overall combustion performance index improvement of 63.5% when compared to sludge. Increasing the ratio of plastic to pine might further enhance the molded fuel’s combustion performance; When the fuel’s pyrolysis temperature was raised, the fuel’s maximum combustion rate, integrated combustion performance index, and calorific value all tended to rise before falling; Increase the pyrolysis time of molded fuels, the combustion performance of the fuel is basically unchanged.