The invention provides a conformal structure and gas circuit backflow-prevention blowing device. The conformal structure and gas circuit backflow-prevention blowing device comprises a sealing cabin, a reflector base is fixed to the sealing cabin, and a light window is arranged in the sealing cabin and is compressed and fixed to the sealing cabin through a light window gland. The conformal structure and gas circuit backflow-prevention blowing device is characterized by further comprising a blowing device body, at least part of the blowing device body is located inside the sealing cabin, and the blowing device body is used for blowing the light window. The design that a gas circuit and a structure are integrated is adopted, multiple partial assemblies are in gas circuit connection, and the internal space in the device is fully utilized. A one-way gas valve is adopted, and rubber is adopted as sealing materials, so that the one-way gas valve has low spring pressure to meet sealing in the non-working state, an arc sealing ring makes contact with a rubber sealing pad, and abrasion to the sealing pad in use is reduced. Blowing nozzles which are distributed in group are adopted, and the distribution range of the blowing nozzles covers most of the range of the light window.