The invention relates to a manufacturing method for guard stone commonly used in river emergency and construction, in particular to a production method for guard stone of a sediment core reinforced concrete composite structure. The production method comprises the following construction manners that after sediment, clayey soil and straw stalks are mixed, forceful stirring is carried out through a stirring machine; the soil mixture which is evenly stirred is placed in a steel die, and vibrating and pressurizing are carried out to manufacture a soil blank; a steel fiber net is placed in the middle of the steel die, and prepared impervious concrete is poured for bottoming; the soil blank is placed in the center of the steel die, and the prepared impervious concrete is poured; and after eight hours, the die can be stripped, and standard maintaining is carried out. The manufacturing method has the beneficial effects that the appearance is regular, transporting, arranging and throwing are facilitated, the labor intensity of workers is relieved, and efficiency is greatly improved; the manufacturing cost is low, industrial production is facilitated, and the technology is simple; and application and popularization are easy, impacting and crushing are resisted, and stability is good.