Abstract: The present invention refers to a filling machine for highly compressed gas, comprising: an electric driver, a reduction gearbox, a driving shaft, an eccentric driving mechanism, an high-compression mechanism, a cylinder manifold and a framework, wherein the eccentric driving mechanism consisting of at least two eccentric driving wheels is mounted on the driving shaft, the high-compression mechanism consists of at least two oscillating type compression gas cylinders connected in series by a plurality of one-way valves and hoses, and a slip ring, a piston rod and a piston are joined into an integral block wherein the slip ring is fitted over the eccentric driving wheel and the other end of the piston rod is connected to a gas cylinder barrel so as to be fitted over a supporting shaft; the supporting shaft is provided in the framework and the framework is provided with a cylinder manifold on the top thereof, which is provided with a pressure switch, a pressure gauge and a safety valve; the outer circumferential