The utility model discloses a dry-type slag extractor provided with an outer-circulation bucket elevator and used for a coal-fired boiler. The dry-type slag extractor comprises a coal-fired boiler air-cooled dry-type slag extractor body, the outer-circulation bucket elevator, a sweeping chain and a conveyer belt, wherein the outer-circulation bucket elevator is located at the turning section or the tail section of the coal-fired boiler air-cooled dry-type slag extractor body, the sweeping chain and the conveyer belt are installed in the coal-fired boiler air-cooled dry-type slag extractor body, the sweeping chain is located at a feeding port of the outer-circulation bucket elevator, and the two ends of the sweeping chain are located at the tail section and the turning section of the coal-fired boiler air-cooled dry-type slag extractor body respectively; the conveyer belt is located at a discharge port of the outer-circulation bucket elevator, and the two ends of the conveyer belt are located at the tail section and the head portion of the coal-fired boiler air-cooled dry-type slag extractor body respectively; the sweeping chain is located under the conveyer belt. According to the dry-type slag extractor, abrasion of the sweeping chain can be reduced, and the ash removing efficiency of the sweeping chain is improved.