The utility model relates to a large-scale cable rod type extension arm expansion drive mechanism, which relates to a space cable rod type extension arm expansion drive mechanism. It can solve the problem that the large cable-rod extension arm in the existing space is driven by a four-thread spiral lifting sleeve mechanism, which has high manufacturing precision and high manufacturing process requirements, and the extension arm is easy to "stuck". The bottom end cover (1), the retracting sleeve (2), the derotation sleeve (3), and the driving sleeve (4) are fixed together, and the inner wall of the derotation sleeve (3) is provided with eight curved grooves ( 15), eight linear tracks (9) are fixedly installed on the inner wall of the retracting sleeve (2), and the driving sprocket (10) and driven sprocket (13) driven by the chain (11) and the driving sleeve (4) Fixed connection, three chain tooth pieces (12) are equidistantly installed on each chain (11), and rollers (6) are fixedly installed on each top angle of the cable-bar type extension arm assembly, and the rollers (6) are inlaid with The stretch arm tooth piece (5), the chain tooth piece (12) meshes with the stretch arm tooth piece (5), and the driving sprocket (10) is connected by a reversing transmission mechanism. The invention has the advantage of strong ability to accommodate the deformation and processing errors of the extension arm.