Fireproof plugging device for cable protection pipe

The utility model belongs to the technical field of cable protection, particularly relates to a fireproof plugging device for a cable protection tube, and aims to solve the problems that the conventional fireproof plugging device for the cable protection tube mainly adopts a mode of filling fireproof daub and fireproof coating to plug a tube orifice, and the tube orifice cannot be sealed due to natural conditions. In order to solve the problems of falling, cracking, collapsing and the like of fireproof plaster due to thermal expansion and cold contraction along with seasonal changes, the utility model provides the following scheme: the fireproof plaster comprises a protective sleeve, a protective tube is arranged in the protective sleeve, the right end of the protective tube extends to the right side of the protective sleeve, a cable is arranged in the protective tube, and the left end of the cable extends to the left side of the protective sleeve; the right end of the protective sleeve is symmetrically and r