The invention discloses a sealing ring having an ESD protection function. The sealing ring comprises a substrate portion structure and a metal connection structure, wherein the substrate portion structure comprises a first conductive type well region, and first to third doping regions formed on a surface of the well region, wherein the first and second doping regions are both second conductive type heavy doping, the third doping region is first conductive type heavy doping, the first doping region, the first conductive type well region and the second doping region form a bipolar transistor, the metal connection structure comprises two electrode structures, the first electrode structure is electrically connected with the first doping region, the second electrode structure is electrically connected with the second and third doping regions, and a portion between a collector region and a base region of the bipolar transistor is made to be a reverse-biased structure through the voltage applied to the first and second electrode structures. The sealing ring is advantaged in that the ESD protection function is realized, an area of the sealing ring can be effectively utilized to realize an ESD protection structure, the area can be saved, and an integration level is improved.