A terminal block wiring device includes a terminal block and a wiring jig (20, 20a). The wiring jig includes a handgrip (21, 21a) and a hook arm (22, 22a), the handgrip (21, 21a) is formed with a first positioning protrusion (211, 211a), the hook arm (22, 22a) is formed with a second positioning protrusion (221, 221a), the wiring jig (20, 20a) is able to be positioned on a terminal block (10, 10a) through the first positioning protrusion (211, 211a) and the second positioning protrusion (221, 221a); when an external force is applied and the first positioning protrusion (211, 211a) is served as a pivot, a cable (2) is enabled to be rapidly inserted and electrically connected to an electric conductive terminal (12), so effects of fast, convenience and labor saving of the wiring operation can be achieved, and the wiring efficiency can also be increased.