The invention discloses a fireproof cable sleeve. The fireproof cable sleeve is composed of a cable bushing, a connection sleeve, a sealing plug and a broken cable alarming system. The cable bushing is composed of at least two sections of cable passing pipes which are connected through the connection sleeve. The connection sleeve is composed of a pipe wall and a baffle, the cable passing pipes are of a hollow tubular structure, the pipe wall is composed of an outer insulation wall and an inner hot melting wall, and the outer insulation wall and the inner hot melting wall are connected through rib plates to form a fireproof cavity. The broken cable alarming system is composed of a power source, a switch, a buzzer, an early warning wire and an adjusting resistor, and the early warning wire is embedded into the inner hot melting wall and surrounds the inner hot melting wall. On one hand, the cable ignition accident can be effectively eliminated in time and an alarm is given out in time, so that the risk that a cable triggers a fire is reduced greatly; on the other hand, the situation that after one cable breaks down and causes a fire, adjacent cables are damaged is effectively and completely eradicated, the fire damage is reduced greatly, the restoration cost needed after a disaster happens is saved largely, the restoration time spent after a disaster happens is shortened, and the efficiency for eliminating the fire accident is improved.