The invention provides a permanent magnetic spring rectilinear motion device which comprises an end cover, a permanent magnet, a magnetic block, a winding dynamic iron core and a base. The winding dynamic iron core is arranged inside a cavity formed by the end cover and the base and is arranged along the central axis of the cavity. The two ends of the winding dynamic iron core penetrate through a central through hole in the end cover and a central through hole in the base respectively. In the cavity, the magnetic block is arranged around the winding dynamic iron core. The permanent magnet is arranged between the magnetic block and a magnet yoke on the inner wall of the end cover. The permanent magnetic spring rectilinear motion device is characterized in that grooves perpendicular to the axis of the winding dynamic iron core are formed in the winding dynamic iron core at intervals, and winding coils are arranged inside the grooves. Compared with the prior art, the permanent magnetic spring rectilinear motion device solves the problem that a switch capacitor cluster switch is large in mechanical dispersibility, then indirectly solves the technical problem that electrical service life is short, and provides reference for follow-up study on a switch capacitor cluster switch with the long electrical service life.