The invention relates to a valve needle control system and method for an injection moulding machine mould as well as a storage medium. The system comprises a position sensor and a processing device, wherein the position sensor is arranged on an ejection device of an injection moulding machine; the position sensor is connected with the processing device; the processing device is connected with a valve needle of the mould; the position sensor synchronously moves along with a screw in the ejection device, and is used for detecting the position when the screw performs injection work according to preset injection moulding parameters in real time, generating a position signal and sending the position signal to the processing device; and the processing device is used for receiving the position signal and a power supply ejection signal of the injection moulding machine, and controlling opening or closing of the valve needle according to the position signal and/or the power supply ejection signal. The valve needle is opened or closed according to the injection position of the screw and an injecting starting or ending state of the screw, so that glue inlet amount of the valve needle is quantitatively controlled, and therefore, the quality defect due to the fact that time schedule controller parameters caused by unstable pressure of the injection moulding machine are invalid is avoided, and control accuracy of glue inlet is improved.