Protective device for sheet metal part cutting

The utility model discloses a protective device for cutting sheet metal parts, which relates to the technical field of protection for cutting and comprises an upper protective cover, and a lower protective cover is slidably mounted on the upper protective cover. Wherein the lower protective cover rotates around the center of the upper protective cover, so that the lower protective cover slides on the inner side wall of the upper protective cover, and a side plate is fixedly mounted at the side end of the upper protective cover; wherein a groove is formed in the outer side wall of the side plate and has a guiding function, and a sliding block is fixedly installed at the side end of the lower protective cover; wherein the sliding block is of a U-shaped structure, a semicircular through hole is formed in the side end of the upper protective cover, the sliding block penetrates through the through hole to be connected with the lower protective cover, and a pull rod is fixedly installed at the side end of the slidi