The invention relates to a roasting furnace coal bed gas and coal gas mixed burning method. The method is characterized in that a roasting furnace coal bed gas V19 burner and a coal gas V19 burner are adopted in the mixed burning process, the spray guns of the coal bed gas V19 burner are located below the spray guns of the coal gas V19 burner, and the number of the spray guns of the coal bed gas V19 burner and the coal gas V19 burner is determined according to a same heat equivalent principle. The method effectively reduces the roasting cost by 5-10%, solves the problem of safe use of two fuels with a calorific value difference of 0-6 times in a roasting furnace, is simple, and has obvious technical and economic advantages.