The invention discloses a high-weldable environment-friendly ultra-fine solder wire for intelligent manipulator welding and a preparation method thereof. Silver, copper, molybdenum, cerium, tellurium and lutetium, the addition of cerium can change the structure of the solder, thereby refining the grains, reducing solder joint bridging, changing the surface wettability of the solder alloy, improving creep properties, tensile Characteristics, the addition of tellurium can improve the corrosion resistance, wear resistance and strength of the material, can improve the tensile strength of the solder and prevent the generation of tin whiskers, lutetium has good conductivity and ductility, and has a strong activation in solder alloys The powder has an excellent effect on improving the electrothermal performance and anti-oxidation performance, improves the tensile strength and toughness of the solder, has good solder wire wettability, excellent tensile strength and is lead-free and environmentally friendly. This application has the advantages of high solderability and not easy to break the core , High solderability and lead-free environmental protection development of products when applied to high-end application fields such as intelligent manipulator welding.