The utility model discloses a hydraulic support pushing mechanism and a low-seam hydraulic support. The hydraulic support pushing mechanism comprises a pushing jack, a front pushing rod and a rear pushing rod, wherein the rear pushing rod is connected with a base of a hydraulic support, the pushing jack is in an inverted form with a front cylinder and a rear piston rod, the cylinder is connected with the rear pushing rod, and the piston rod is connected with the front pushing rod. Besides, the front pushing rod is connected with a round steel guide rail, the rear pushing rod is connected with a steel pipe runner, and the round steel guide rail is inserted into the steel pipe runner. The front pushing rod extends or retracts along with feeding and returning of liquid in an upper cavity and a lower cavity of the pushing jack mounted in an inverted form, so that the support completes pulling and pushing circulation action. As stress of the pushing jack is reasonable in distribution, the service life of the piston is prolonged greatly. Accordingly, the hydraulic support pushing mechanism is suitable for the low-seam hydraulic support and hydraulic supports of other coal seams.