The invention discloses a method for increasing mixing amount of road cement mineral powder. The method comprises the following steps: regulating graduation of a mill, namely setting an activating current-limiting ring in a fine grinding cabin, wherein the current-limiting ring is used for grinding powder, controlling flow and raising materials; regulating the graduation of a grinding body in the mill according to the types of the materials and cement, wherein the adjustment of comprehensive material parameters comprises the steps of size of a screening device and the process parameters of in-mill ventilation and the rotation speed of the mill, and the powder selection efficiency of the mill is optimized; demarcating and detecting a measuring scale at regular intervals; increasing the strength of clinker. According to the method for increasing the mixing amount of the road cement mineral powder, the defects of unreasonable graduation, poor measuring accuracy and low clinker strength of the mill in the prior art can be overcome, so that the advantages of reasonable graduation, good measuring accuracy and high clinker strength of the mill are achieved.