The invention relates to an automatic feed back mechanism for a bearing machining equipment chain plate assembly line. A discharging opening of a rotary baiting disc is connected with a feeding opening of a fourth baiting channel. A discharging opening of the fourth baiting channel is connected with a first feeding opening of a first rotary type plate chain conveyor. A first discharging opening of the first rotary type plate chain conveyor is connected with a feeding opening of a first baiting channel. A discharging opening of the first baiting channel is connected with a first feeding opening of a second rotary type plate chain conveyor. A first discharging opening of the second rotary type plate chain conveyor is connected with a feeding opening of a second baiting channel. A discharging opening of the second baiting channel is connected with a second feeding opening of the first rotary type plate chain conveyor. A second discharging opening of the first rotary type plate chain conveyor is connected with a feeding opening of a third baiting channel. A discharging opening of the third baiting channel is connected with a feeding opening of the rotary baiting disc. By the adoption of the automatic feed back mechanism, the potential quality hazard existing in the man-made material carrying process is avoided, and the human cost is saved. The automatic feed back mechanism is simple in structure and high in automation degree.