The invention relates to a tin-based alloy and copper strip composite material and a preparation method thereof, and belongs to the field of non-ferrous metal high-frequency brazing machining. The tin-based alloy and copper strip composite material is composed of a core material and a coating wrapping the surface of the core material; the core material is a copper strip, the coating is a tin-basedalloy, and the thickness of the single-side coating ranges from 20 [mu]m to 100 [mu]m. According to the preparation method, a high-frequency brazing principle is adopted, and a compact tin-based alloy material plating layer is formed on the surface of a copper strip; the method comprises the steps of copper base strip material surface soldering flux presetting, copper strip and brazing filler metal compounding, high-frequency induction rapid brazing, air cooling solidification, strip material axis-winding packaging and the like, and the method is simple in process and suitable for batch production. The tin-based alloy and copper strip composite material prepared through the method has the advantages of being free of solder skip and tin nodule defects, good in conductivity, high in weldability, good in corrosion resistance, good in oxidation resistance, firm in coating and the like, is mainly applied to the electronic industrial fields of electronic components, hybrid integrated circuits, solar photovoltaic modules and the like, and has wide market prospects.