The invention discloses a self-adaptive changeable-rail door system for a multi-angle inclined elevator. The self-adaptive changeable-rail door system comprises a car door and a landing door; a car door motor plate is arranged on the bottom of the car door, door motors are arranged on the car door motor plate and are provided with car door hooks capable of moving horizontally, and a car bearing frame is arranged below the car door motor plate and is provided with a bearing frame changeable-rail self-adaptive mechanism; landing door motor plates are arranged on the bottom of the landing door and are provided with a landing door electromagnetic locking device. The self-adaptive changeable-rail door system further comprises a door vane bearing plate mechanism, a door vane locating and locking mechanism, a steel wire rope transmission door vane mechanism, a gear and rack mechanism, a cam mechanism and a steel wire rope transmission door lock roller mechanism. According to the system, a door vane is arranged on a T-shaped door vane bearing plate between the car door motor plate on the bottom of the car door and the car bearing frame, is arranged in parallel with the car bearing frame, can penetrate through a landing door lock roller along with the movement of the car bearing frame and is pulled by the steel wire rope transmission door vane mechanism in linkage with the door motors so as to move in the direction perpendicular to the direction of the door vane, and therefore the landing door can be opened.