The invention belongs to the field of energy storage battery equipment and particularly relates to an insulated and sealed electrode for a liquid metal battery. The insulated and sealed electrode comprises an electrode core, an upper transition ring, an insulating sleeve, a lower transition ring and a battery cover plate, wherein the upper transition ring, the insulating sleeve, the lower transition ring and the battery cover plate are sequentially arranged from top to bottom in a sleeving manner; a lower port of the upper transition ring and an upper port of the lower transition ring are in astepped shape; the upper end and the lower end of the insulating sleeve are matched with the stepped parts of the upper transition ring and the lower transition ring separately; the upper port of theupper transition ring is matched with the diameter of the electrode core and is in sealed connection with the battery core; the outer diameter of the lower port of the lower transition ring is matched with the inner diameter of a center hole in the anode cover plate and the lower port of the lower transition ring is in sealed connection with the center hole; and the stepped positions outside theupper transition ring and the lower transition ring are in arc transition. The invention further provides a preparation method of the sealed and insulated electrode. Through improvement in the electrode structure and raw materials, the airtightness and the insulating property of the battery can be ensured for a long period of time, meanwhile, the size of the battery can be reduced, the space utilization rate of the battery is improved and the consistency of the battery quality is ensured.