A magnetic light source adaptor includes a main body, a control module and a magnetic unit. The main body has a male portion and a female portion. A first conducting set is disposed within the female portion, whereas a second conducting set is arranged on the male portion. The control module is arranged on the main body and electrically connecting the first and second conducting sets. The magnetic unit attaches to the main body to facilitate positioning of the magnetic light source adaptor. The magnetic light source adaptor and a light source are detachably assembled for easier access under maintenance and replacement.