An electricity-producing shoe comprises a shoe body including an electricity-producing module and an electricity generator mounted therein. The electricity-producing module includes a rack, first and second gears, and a spring buffer that mounts between the first and second gears. The first and second gears are engaged with the rack and an axial gear of the electricity generator, respectively. The electricity generator has an electricity output terminal connected to an electric device of the shoe body. As a result, the rack drives the first gear and the second gear drives the axial gear of the electricity generator by means of normal stepping motion of walking for producing electric power and thereby supplying the electric power for the electric device.