The invention relates to a preparation method of a silver-doped molybdenum disulfide composite material mixed solution. Aiming at the situations that molybdenum disulfide is low in sensitivity and response speed, silver nitrate, sodium citrate, thiourea and sodium molybdate are taken as the raw materials and are subjected to hydrothermal synthesis so as to prepare silver nano-particles, and the silver nano-particles are subjected to solution polymerization so as to prepare the silver-doped molybdenum disulfide composite material mixed solution. The preparation method has the beneficial effects that the process is advanced, the data is complete and accurate, a prepared silver-doped molybdenum disulfide composite material is in a liquid state and is of a petal shape, the gradation of petals is distinct, the sizes of the petals are 200nm-1000nm, the product purity reaches 99.6%, the silver nano-particles are uniform in size and good in dispersity, the diameters of the silver nano-particles are less than or equal to 80nm, the silver nano-particles are uniformly attached to the petals, and the preparation method for preparing the silver-doped molybdenum disulfide composite material is advanced.