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A novel process technology to prepare glass-ceramics directly from molten steel slag (MSS) is proposed in the study. The liquid-solid mixing method was used to adjust the components of the MSS and glass-ceramics was obtained.The effects of heat-treatment conditions on the microstructure,physical and mechanical properties of samples were studied.Economical benefits of the novel process were analyzed. The results show that heat-treatment is a very effective approach to achieving crystallization. The dominant crystal phase in products is diopside [(Mg6Al2Fe2) Ca (Si1.5 Al5) O2]. The shape of the crystallization is like a granule. The glass-ceramic samples exhibited good mechanical properties and presented chemical stability. The economic benefits of the process are remarkable due to less energy consumption compared with conventional glass-ceramics production methods.