A connecting device with multiple axial connectors. The connecting device includes a main base and a plurality of connectors, wherein the main base has a long shape. A plurality of first through holes are formed on the main base, and the connectors extend through the first through holes. Each connector has a tubular body, and a groove is formed on an outer periphery of the tubular body. A wire extends from one end of the tubular body. A c-shaped clamp joins the groove and presses an inner surface of the first through hole, whereby the connectors is secured to the main base. The difficulty of maintenance of the connecting device is reduced.