The invention relates to a chain double-stroke lifter, which comprises a frame, a carriage, a lifting frame, a rollgang, wherein the carriage is connected on the frame in a sliding mode; an installation plate is fixedly arranged on the carriage; the lifting frame is arranged on the carriage through the installation plate; the rollgang is arranged on the lifting frame; the top frame of the frame is provided with a fixed chain wheel; the bottom frame of the frame is provided with a cylinder lifting device which is provided with a cylinder head; the cylinder head is provided with a lifting chain wheel in a rotation mode; one end of a driving chain is fixed on the frame; and the other end of the chain wheel is fixed on the carriage; the middle section of the driving chain is meshed with the fixed chain wheel and the lifting chain wheel. In the invention, the cylinder and the lifting chain wheel are adopted to realize the action of double strokes, thereby simplifying the whole structure, improving the work efficiency, reducing the production cost, and being very suitable for use as a shifting tool between pipelines at different height.