The utility model relates to an objective lens switching device for the optical head, which takes advantage of an objective lens box. The utility model integrates the objective lens for CD and the objective lens for DVD in an optical head for reading the information on the optical disk into a lens box, which implements the selection of the objective lenses by the user or automatic switching of the objective lenses by the magnetism. The utility model has the advantages that solving the problems in the prior art that: with the prior art, the rotary inertia results the flutter phenomena, and the flutter of the rotating disk results the exceptions in the servo system, and the difficult switching for adopting the way of the spindle perturbation which results the enter of the laser gets away from the center of the objective lens little by little when performs the tracing, which lower the reading quality of the signal.