Method, device and equipment for storing data after power-off of withdrawal and straightening machine

The invention discloses a method, a device and equipment for storing data after a withdrawal and straightening machine is powered off, the method is applied to a withdrawal and straightening machine servo control system, the withdrawal and straightening machine servo control system comprises a controller, a servo driving device and a servo motor, and the method comprises the following steps: before the withdrawal and straightening machine is powered off, the servo driving device drives the servo motor to rotate; the controller reads the position code value of the servo motor from the servo driving device according to the scanning period so as to obtain position period data; when the withdrawal and straightening machine is powered off, responding to a power-on preparation signal of a servo driving device, and by analyzing position period data, taking a position code value of a previous scanning period corresponding to the power-on preparation signal as a target position code value; and when the withdrawal and