Solid electrolyte is considered to be one of the effective solutions to the safety problem of lithium-ion batteries, while inorganic solid electrolytes have been widely studied because of their highest ionic conductivity. The preparation method has a great impact on the performance of inorganic solid electrolyte. Therefore, seven preparation methods of inorganic solid electrolyte, including high temperature solid phase method, sol-gel method, chemical coprecipitation method, hydrothermal, casting method, magnetron sputtering method and 3D printing method, were reviewed. The principle and research status of the above-mentioned preparation methods were discussed and their advantages and disadvantages were compared. Finally, the preparation method of inorganic solid electrolyte was prospected, in order to provide a new idea for the preparation of inorganic solid electrolyte and open up new possibilities in industrial production and scientific research.