The invention relates to a constant pressure damping control and buffering system, which belongs to the technical field of hydraulic buffering, and includes a first hydraulic cylinder and a second hydraulic cylinder, as well as a first one-way valve, a second one-way valve, a first one-way overflow valve, a second one-way overflow valve and a pressure regulating valve, wherein a second hydraulic cylinder rodless cavity, a first hydraulic cylinder rod chamber, a first one-way valve, the pressure regulating valve, the first one-way overflow valve, a second hydraulic cylinder rod chamber and a first hydraulic cylinder rodless cavity are sequentially connected in series to form a first oil circuit; and the first hydraulic cylinder rodless cavity, the second hydraulic cylinder rod chamber, the second one-way valve, the pressure regulating valve, the second one-way overflow valve, the first hydraulic cylinder rod chamber and the second hydraulic cylinder rodless cavity are sequentially connected in series through a pipeline to form a second oil circuit. The constant pressure damping control and buffering system has unique design, low manufacturing cost, convenience for maintenance, excellent buffering effect, and the functions of locking and safety protection in case that the turning angle of vehicle is too big.