The invention discloses a rear fuselage protection system, which relates to the technical field of airplane tail protection. The rear fuselage protection system comprises a mechanical part and a control part, wherein the mechanical part comprises an actuator, a rocking arm, a linkage mechanism, a sliding cover and a rail; a piston rod of the actuator is connected with the rocking arm, and the other end, which is opposite to the piston rod, of the actuator is fixed to a fuselage; the rocking arm is connected to the fuselage by virtue of a rotating shaft and can rotate around the rotating shaft, and a roller is arranged on the other end, which is opposite to the rotating shaft, of the rocking arm; one end of the linkage mechanism is fixed to the rocking arm, and the other end of the linkage mechanism is fixed to the sliding cover; the control part is used for controlling the rocking arm to retract and extend. The rear fuselage protection system has the beneficial effects that in normal flight of an airplane, the mechanical part is retracted in the fuselage, when the airplane takes off or lands, if a signal of the control part is received by the mechanical part, the rocking arm extends to protect the rear fuselage, and when the airplane takes off, the rocking arm is retracted, so that the airplane is in a good aerodynamic shape, and the aerodynamic performance is improved.