The utility model relates to an automatic pressing machine for gears and chain wheels. The automatic pressing machine for gears and chain wheels is characterized in that a rotating base is rotatably arranged on a workbench, a gear shaft base is coaxially mounted on the rotating base, three sets of gear ejection tooth mechanisms are evenly arranged on the rotating base around the gear shaft base in the circumferential direction, each gear ejection tooth mechanism comprises a first sliding table cylinder which is mounted in the radial direction, and the first sliding table cylinders are connected with gear ejection blocks; a supporting plate is arranged above the gear ejection tooth mechanisms, the three sets of gear ejection tooth mechanisms are evenly arranged on the supporting plate around the gear shaft base in the circumferential direction, chain wheel ejection tooth mechanisms comprise second cylinders and third sliding table cylinders which are mounted in the radial direction, and the third sliding table cylinders are connected with chain wheel ejection blocks; a movable industrial camera is arranged on the supporting plate on one side of the gear shaft base. The automatic pressing machine is simple and compact in structure, the positions of gear and chain wheel identification holes can be recognized automatically, the pressing machine can be automatically rotated to be at the needed angle for pressing, the pressing angle deviation, tooth staggering and dislocation caused by human factors are overcome, the pressing efficiency is improved, and the pressing quality and precision are guaranteed.