The invention provides a method and a device for controlling thread tension of needle positions of an embroidering machine as well as a storage medium. The method comprises the following steps: determining whether the thread tension values of the embroidering machine needs to be adjusted through a control device according to first thread tension values corresponding to needle positions in color-changing codes when executing to the color-changing codes, controlling the embroidering machine to pause the embroidering process if the thread tension value of the embroidering machine is needed to beadjusted, and sending an adjustment command to a thread tension adjusting device of the embroidering machine, wherein the adjustment command is used for indicating the thread tension adjusting deviceto adjust thread tension values of the needle positions of the embroidering machine to be the first thread tension values. Through the method and the device for controlling the thread tension of the needle positions of the embroidering machine as well as the storage medium, the thread tension of the needle positions of the embroidering machine can be automatically controlled; the production efficiency of embroideries is improved; the quality of the embroideries is ensured.