The invention discloses a chassis articulating system which is applicable to a rear engine large articulated bus. The chassis articulating system comprises three parts of a split truss structure, a hydraulic control system and an electric control unit, wherein the split truss structure mainly realizes the articulation of a front compartment and a back compartment of the large articulated bus; thehydraulic control system is mainly used for providing the damping force which is correspondingly increased along with the increase of a rotation angle of the front and the back compartments for the large articulated bus, thereby stopping the sideslip of a second bridge of tires during the turning of the large articulated bus and preventing the shear of the front and the back compartments; the electric control unit is mainly used for monitoring the status of the large articulated bus, controlling the on/off status of an electromagnetic valve and a throttle valve in the hydraulic control systemand emitting an alarm signal. The invention has the advantages that each part of the split structure is mutually independent and interrelated, the requirements on the manufacturing process are lower,the manufacturing cost is low; the maintenance is convenient, the cost is low; the operation stability is good; the shock absorbing effect is good; the system strength is high and the load capacity isgreat.