1. A control pull-bar structure of a chair adjusting device, wherein the chair adjusting device at least comprises a control pull-bar, and the control pull-bar comprising an elongate plate assembly and a short plate assembly; the elongate plate assembly is formed of a plurality of elongate plates, the elongate plates being formed with a movement hole and a pivot hole at one end opposite to the movement hole, connecting protrusions being formed on one side of each elongate plate adjacent the pivot hole, a back side of the connecting protrusions being formed with connecting dimples; every two pieces of the elongate plates interpose therebetween separator plates, the separator plates comprising through holes corresponding to the pivot holes of the elongate plates, the separator plates comprising combination projections, combination notches being on a back side of the combination projections, the combination projections being receivable into the connecting dimples, the connecting protrusions being receivable into the combination notches; the short plate assembly is formed of a plurality of short plates, the short plates being formed with a pivoting aperture, the short plates being provided, on one side thereof, with engaging projections, engaging troughs being on a back side of the engaging projections; every two pieces of the short plates interpose partition plates therebetween, the partition plates comprising fitting bulges corresponding to the engaging troughs, fitting recesses being on a back side of the fitting bulges, the fitting bulges being receivable into the engaging troughs, the engaging projections being receivable into the fitting recesses.