The present invention discloses the method for producing artificial stone using used ground coffee including the steps of drying the used ground coffee; mixing and stirring resin, color and metal salt initiator thoroughly; then mixing used ground coffee, calcium carbonate or aluminum trihydrate (ATH) or mixtures of both calcium carbonate and aluminum trihydrate and peroxide with mixtures of resin, color and metal salt initiator; then stirring whole mixtures and leaving the mixtures to form a gel; next filling the mold with gelated mixtures and leaving them for setting at room temperature; removing and drying artificial stone in an oven to complete the reaction and to achieve the excellent product; then coating products with waterproof agents (Water Repellant; Water Repellant Preservative) or coated with resin as lacquer.