A method and a system for processing a return product are proposed, in which the system for processing a return product allows a manufacturer to inquire return product data through a browser of a terminal device and a network communication system. If a return product is tested to function properly by the system, the return product can be packed for exportation if necessary. If a return product does not function properly and is disassembled for obtaining useful assemblies, semi-fabricated products are re-assembled with the useful assemblies to be ready for exportation. If a return product not properly functioning is not disassembled, the return product can be replaced for its unuseful assemblies by useful assemblies, so as to be ready for exportation. This therefore effectively utilizes useful assemblies of return products, and shortens the production time, as well as avoids repetition in work.