An adjustment method for the dynamic stiffness of a rubber joint with liquid damping, and the rubber joint, and the rubber joint comprises metal outer sleeves, a rubber joint body, a throttling channel adjustment device and other parts, wherein the specific structure is as follows: proper holes are arranged on the outer surface of the rubber joint body and pressed-installed with the metal outer sleeves on the outer surfaces thereof to form closed cavities, the cavities are arranged in the relative movement directions of the mandrel and the outer sleeve of the rubber joint body, and symmetrically distributed at the both sides of the axis of the rubber joint body, and the two cavities are connected via a throttling channel; and in this way, when the mandrel and the outer sleeve of the rubber joint perform a relative movement, the volume of one side of each of the cavities at the both sides of the mandrel is reduced, and the volume of the other side is increased, so that a liquid damping medium at the side with the reduced volume flows to the side with the increased volume via pores, and the liquid damping medium generates a damping force while passing through the throttling channel due to damping action. The size of the throttling channel can be changed via the adjustment device, so as to achieve the purposes of adjusting the damping force and obtaining the needed dynamic stiffness.