A tool for assembling and disassembling the front and the rear wheel axle of a motorcycle includes a nut holding base having one side formed with a ratchet recessed groove provided therein with a projecting member having a hexagonal recessed groove formed in the interior. The nut holding base has another side provided with an extension projecting post having an interior bored with a square hole communicating with the hexagonal recessed groove. A connecting holder to be assembled on the nut holding base has one side formed with a hexagonal projecting connector matching with the hexagonal recessed groove of the nut holding base and having an interior disposed with a square insert hole. The connecting holder has another side formed with a hexagonal recessed groove provided with a projecting member bored in therein with an insert hole that communicates with the square insert hole.