The invention provides a gasket sleeve and a gasket component of a fireproof lockset. The gasket sleeve can be folded along the midline to form an upper gasket surface and a lower gasket surface; theupper gasket surface and the lower gasket surface are symmetrically provided with through holes for assembly; or the gasket component consists of the upper gasket surface and the lower gasket surface;the upper gasket surface and the lower gasket surface are symmetrically provided with the through holes for assembly; and the gasket sleeve or the gasket component is prepared from a resin compositematerial which contains flexible resin, expandable graphite and an additive. The gasket sleeve or the gasket component is good in flexibility, excellent in expansion property and good in shape retention after combustion; moreover, by the environmental protection performance, toxic smoke or flame can be effectively prevented from penetrating through a clearance in the lockset when a fire happens, so the phenomenon of scurrying of fire or intoxication is prevented.