This production line successively completes the assembly of all parts of relay (including coil, iron core, yoke, moving spring, base plate, resistance, terminal A, terminal B, terminal C, terminal D, stop piece, shell and other parts), and carries out the inspection of all electrical parameters of the assembled products, selects the defective products found in the assembly and inspection process, and finally outputs the qualified finished products. This production line realizes the full automatic production of relay, reduces the labor cost and improves the production efficiency.