The invention discloses an optimal formula of a solid fermentation condition of Trametes gallic Fr. belonging to the polyporaceae. The optimal formula includes that the proportion of straw to poplar is 5 to 5, the feed liquid ratio is 2 to 5, and the temperature is 35 DEG C. Through the adoption of the optimal formula, the formation speed of fruiting bodies on the 27th day is the highest, myceliaare diverted on GPY culture mediums, massive culturing is performed, and then the cultured mycelia are transferred into a fermentation flask; and through single factor experiment, three conditions influencing high growth speed of the mycelia, including the proportion of the poplar to the straw, the feed liquid ratio and the temperature, are selected for orthogonal experiment; and the optimal formula is obtained through experiment by an orthogonal experiment table, and the fruiting bodies are formed after 27 days.