The invention discloses a hydraulic ejecting and pushing system used for an ejecting and pushing small beam of a final joint. Two oil supplying pipelines are adopted to provide hydraulic oil for jacksarranged at the positions of joints at the two ends of the final joint correspondingly; half of the number of the jacks arranged at the position of the joint at each end of the final joint acquire the hydraulic oil through the first oil supplying pipeline, the other half of the jacks acquire the hydraulic oil through the second oil supplying pipeline, and therefore in the installing process of the final joint, when the jacks are used for ejecting and pushing the ejecting and pushing small beams of the final joint, stability and synchronism are improved when a hydraulic pump provides oil for the jacks. Besides, the two oil supplying pipelines are arranged along the inner wall of the final joint, the plane where the oil supplying pipelines are located is parallel with the end faces at the positions of the joints of the two ends of the final joint, and arrangement of hydraulic pipelines is simplified.