Plugging device used for optical cable leading-down pipe

The utility model discloses a plugging device used for an optical cable leading-down pipe. An optical cable penetrates through the plugging device used for the optical cable leading-down pipe arranged in the pipe mouth of the leading-down pipe. The plugging device used for the optical cable leading-down pipe includes a support layer, a fixing layer, a fireproof layer and a protection layer filled in the pipe mouth of the leading-down pipe successively from bottom up. By adopting the plugging device used for the optical cable leading-down pipe, a problem that leading-down pipe plugging methods in related techniques may cause seasoning crack and falling off easily, so that led-down optical cable protecting effect can be improved.