There is an increasing demand for fueling technology using sewage sludge that is generated during the sewage treatment process. However, there are several challenges to cope with the expanding sewage sludge fueling market. One of them is the problem of stably treating heavy metals contained in sewage sludge. Combustion melting technology is a way to solve these heavy metal-related problems, but commercialization is limited due to high operating costs. Meanwhile, due to the difficulty of securing a landfill for incineration ash treatment, the cost of landfill is rapidly increasing, and the demand for combustion and melting technology is increasing. In this study, the effect of oxygen enrichment rate on the combustion and melting characteristics of sewage sludge solid fuel was investigated through combustion exhaust gas composition, combustion efficiency, slagging rate, weight reduction rate, and volume reduction rate.