As the climate crisis and global environmental problems intensify, policies and technologies for reducing greenhouse gas in industry and life are being emphasized, and the development of eco-friendly synthetic materials with low environmental load while reinforcing the performance of natural materials with building or facility materials is becoming a useful strategy for industrialization of greenhouse gas reduction as well as technical aspects. This study was conducted to present basic data for using coffee ground, a circulating resource, as a material for synthetic wood. The possibility of using the leftover coffee grounds as an alternative facility to reduce the environmental load such as carbon emissions was confirmed by producing it as a synthetic deck material through a drying processing process. It was classified into Type I (50% coffee grounds), Type II (20% coffee grounds), and a control, and the quality suitability and performance with KS standards were verified when the content rates of coffee grounds and wood were different. Compared to KS standards (KSF 3230), the performance of synthetic wood deck materials that recycled coffee grounds satisfied the standards under all three types of experimental conditions, and in particular, it was found to be the best in Type I, which mixed coffee grounds ingredients and wood at a 50% ratio. Coffee grounds, which are circulating resources other than household waste, can be alternatives as sustainable materials with excellent performance that meets quality standards while minimizing environmental pollution or carbon emissions.