1. A training system for an articulated vehicle, wherein the articulated vehicle comprises a first body part, a second body part and a connection part, the proceeding direction of the first body part forms an angle with respect to the proceeding direction of the second body part; the first body part comprises a first connection surface, a first surface, a second surface and a sixth surface, the first surface is opposite to the first connection surface and adjacent to the second and the sixth surfaces; the second body part comprises a second connection surface, a third surface, a fourth surface and a fifth surface, the second connection surface is connected to the first connection surface via the connection part, the fourth surface is opposite to the second connection surface and adjacent to the third and the fifth surfaces, the second surface is adjacent to the third surface, and the fifth surface is adjacent to the sixth surface; the first to the sixth image capturers are respectively disposed on the first to the sixth surfaces for capturing the first to the sixth images, the first image partly overlaps the second and the sixth images, the fourth image partly overlaps the third and the fifth images, the second image partly overlaps the third image, and the fifth image partly overlaps the sixth image; the training system comprises: an automobile-side device; and a training device connected to the articulated vehicle in a training stage, wherein the training device comprises: a movable carrier used for moving one of the first and the second body parts to adjust the angle, such that the angle corresponds to an i-th training angle of N training angles, wherein i is an integral smaller than or equal to N; a feature point unit, wherein when the angle corresponds to the i-th training angle, the feature point unit provides at least one feature point associated with the overlapping capturing region between any two adjacent images of the first to the sixth images, such that the any two adjacent images correspondingly show a first feature point and a second feature point; and a control unit used for determining the N training angles so as to correspondingly drive the movable carrier, wherein the control unit receives the first to the sixth images provided by the processing unit, and respectively records two coordinate sets of the first and the second feature points in any two adjacent images to construct an i-th feature point comparison table with respect to the i-th training angle, and the control unit further constructs an i-th surrounding image model according to the i-th feature point comparison table so as to perform a training process with respect to the i-th training angle; wherein the control unit further adjusts the parameter i to obtain N surrounding image models respectively corresponding to the N training angles in the training stage and provide the N surrounding image models to the automobile-side device.