The invention relates to a double-chamber hydragass spring which comprises an upper lug, a lower lug, a main cylinder, an elastic component, a back pressure cylinder, a piston, a guide pipe and the like, wherein the upper lug is positioned at the upper part of the main cylinder; the lower lug is positioned at the lower part of the back pressure cylinder, the upper lug and the main cylinder are connected through a thread structure, and the lower lug and the back pressure cylinder are connected through a thread structure; the upper lug and the lower lug are both provided with a bearing internally; the side part of the upper lug is connected with the elastic component; and the piston and the guide pipe are installed in the back pressure cylinder. The double-chamber hydragass spring is characterized in that the back pressure cylinder, the piston and the guide pipe are connected into a whole and installed in the cylinder body of the main cylinder; a main cavity is formed by a space among the upper surface of the piston, the main cylinder and the space below the upper lug; a main air chamber is formed by the main cavity, an elastic component oil liquid chamber of the elastic component and an air chamber; a back pressure air chamber is formed by a back pressure chamber in the back pressure cylinder and a ring chamber positioned between the main cylinder and the back pressure cylinder; the back pressure chamber and the ring chamber are connected through a connecting pipe. The double-chamber hydragass spring has the beneficial effects of simple structure, small size, light weight, good tightness and large bearing tonnage and is convenient to arrange and install.