Building wall drilling reinforcing device and construction method

The invention discloses a building wall drilling reinforcing device and a construction method. The building wall drilling reinforcing device comprises a hydraulic column, a connecting piece, a dustproof barrel, a sleeving ring, a rubber soft barrel, a supporting assembly, an exhaust barrel, a high-speed fan and a conical ring, and the top of the hydraulic column is connected with the movable dustproof barrel through the connecting piece; a sleeving ring is fixedly arranged at one end of the dustproof barrel, a rubber soft barrel is arranged on the sleeving ring in a nested mode, an exhaust barrel is arranged at one end of the rubber soft barrel in a nested mode, and a high-speed fan is fixed to the inner wall of the exhaust barrel through a supporting rod; the dustproof cylinder and the exhaust cylinder are detachably connected through a detachable supporting assembly, and a conical ring is integrally arranged at one end of the exhaust cylinder. The movable block is limited by the two limiting covers, so that