The invention relates to a full closed-loop plate shearing machine for calibration compensation. The machine comprises a PLC. The input end of the PLC input end is connected to an upper computer, and the output end is connected to the input end of a servo motor through a position controlling module. The output end of the servo motor is connected to a material feeding roller through a deceleration mechanism. The deceleration mechanism is connected to and synchronously operated with a silicon steel sheet through a length measuring roller. A length measuring decoder is connected to the length measuring roller to convert a length value measured by the length measuring roller into a length signal. The output end of the length measuring decoder is connected to the PLC to feed back the length signal to the PLC. The machine utilizes full closed-loop compensation control to be high in anti-interference ability, perfect in functions, high in applicability, precise in length shearing control, and high in control precision.