The invention provides automatic control equipment of a rail bending machine. The equipment comprises a displacement sensor and a programmable logic controller (PLC), wherein the displacement sensor is movably arranged on one side of the traveling path of a processing part in a rail bending machine, is electrically connected to the PLC and sends the detected position of the processing part to the PLC as an electric signal; and the PLC determines whether to stop operation on the processing part according to the received electric signal.