The present invention relates to an articulated chassis system of large articulated vehicle, which comprises a front beam, a spherical hinge connecting structure, a front frame, a turnplate bearing, a rear frame, a rear beam and a turning angle sensing means, the front beam is connected with the front frame through the spherical hinge connecting structure, the turnplate bearing comprises an inner ring and an outer ring, the front frame is connected fixedly with the outer ring/the inner ring, the rear frame is connected fixedly with the inner ring/the outer ring, the inner ring and the outer ring can rotate relatively, the rear frame is connected with the rear beam, the turning angle sensing means is arranged between the inner ring/the outer ring and the front frame/the rear frame. Preferably, the articulated chassis system of large articulated vehicle further comprises a hydraulic damping buffer system arranged between the front frame and the rear frame, the turning angle sensing means comprises an angle sensor, a first angle sensor and a second angle sensor, the spherical hinge connecting structure comprises a spherical hinge bracket structure and a spherical hinge. The present invention is designed uniquely and skillfully, has a simple and compact structure, is easy to install, so as to enhance the safety, stability and durability of the articulated chassis system of large articulated vehicle, and lower the cost, therefore the present invention is suitable for large-scale popularization.