The invention discloses a magnetic type pressure seal device. The pressure seal device comprises a seal cover and a magnetic rubber seal plate, wherein the seal cover is provided with a cover body in the shape of a round cap; a skirt seat is arranged on the edge of an opening of the cover body; a plurality of adsorption force adjustable permanent magnetic switches are arranged around the opening of the seal cover in the skirt seat; each permanent magnetic switch is provided with a control rotary shaft; a part of the rotary shaft, which is exposed out of the upper surface of the skirt seat, forms a section matched with a rotary tool; the magnetic rubber seal plate covers the whole lower surface of the skirt seat and extends to a part in the cover body in the shape of the round cap; the extending section is in the shape of an expanded bottleneck and is clung to the inner wall of the cover body in the shape of the round cap; and a magnetic seal ring is arranged around the opening of the seal cover on the lower surface of the magnetic rubber seal plate. The magnetic type pressure seal device has a good sealing effect; and the used permanent magnetic switches have closed magnetic force lines and strong adsorption forces, have small magnetic forces before the pressure seal operation is carried out, are easy to position, can be adjusted to be in a small adsorption force state when being dismounted, and are easy to dismount.