A driver for a brass cylindrical type nut for an electrical terminal includes a handle, a sleeve, and a rotation axle. The handle has an exterior wall and an interior wall, in which the interior wall has a first accommodating space, and the exterior wall has a plurality of notches formed thereon in communication with the first accommodating space. The sleeve disposed in the first accommodating space and coupled to the interior wall further has a second accommodating space and a coupling opening arranged at a front end of the sleeve. The rotation axle is disposed in the second accommodating space and has a thread mated with the brass cylindrical type nut at an end corresponding to the coupling opening, while a rotation nut arranged within the first accommodating space and corresponding to the pair of notches is connected to the rotation axle.