The invention relates to a preparation method of a high-solid-content polyacrylamide emulsion. According to the preparation method, solvent naphtha with low viscosity and high carrying capacity is used to form a water-in-oil emulsion with high monomer concentration and ensure that oil-water separation, demulsification caking and other phenomena will not occur during the polymerization process; and by a low-temperature initiating and segment initiating technology, reaction time of each polymerization stage is adjusted according to ion type of the emulsion so as to obtain the high-solid-content polyacrylamide emulsion. The invention has the following beneficial effects: by the low-temperature initiating and segment initiating technology, the heat-dissipation problem during the preparation process of the high-solid-content emulsion is solved; corresponding process adjusting is carried out in allusion to cationic, anionic, nonionic and other emulsion types; and the preparation technology of multiple ionic types of emulsion meets application requirements of various industries such as water treatment, papermaking, oilfield exploitation and the like.