The project proposes a new process for preparing PbTe thin films and nanoparticles. Currently, PbTe thin films are typically prepared using physical methods such as vacuum evaporation, laser flash evaporation, and magnetron sputtering, which require expensive coating equipment and thus have high costs. Electrochemical deposition of PbTe thin films is relatively cost-effective, but the disadvantage is that it must be performed on conductive substrates, limiting its application scope. PbTe nanoparticles are mostly synthesized using hydrothermal or solvothermal methods, electrochemical methods, emulsion methods, etc. These methods either involve high-pressure equipment, complex instruments, and lengthy processes, or introduce a large amount of organic matter, posing challenges to post-treatment and environmental protection. The proposed project suggests using alkaline aqueous solutions as solvents and low-cost lead-containing inorganic salts, tellurides, or tellurites as reactants, under normal pressure and Room temperature to 50°C synchronous synthesis of PbTe film and nanoparticles, the prepared film is flat and dense without special requirements for the substrate, the size of nanoparticles is uniform and can be adjusted with temperature. Compared with other existing methods for preparing PbTe films and nanoparticles, this method is simple and easy to operate, with high cost-performance ratio, almost no energy consumption, and the reaction medium is an easily purified aqueous solution, which is conducive to environmental protection. This technology is suitable for the semiconductor field and can be used to prepare thermoelectric devices, solar cells, fluorescent devices, infrared optical components, infrared thin-film devices, etc. Using this technology can greatly reduce the production cost of products.