The invention relates to a plugging head for effectively preventing oil leakage of a high voltage breaker hydraulic mechanism and a manufacturing method thereof aims to solve a problem of incapabilityof effectively plugging an oil nozzle when oil leakage of the hydraulic mechanism is aggravated because of external interference existing in a high voltage breaker. The plugging head comprises a fastening portion, a plugging portion and a locking mechanism, wherein the fastening portion and the plugging portion are respectively a hollow cylindrical structure, a bottom surface of the plugging portion is enclosed, the fastening portion is coaxially fixed at an upper portion of the plugging portion, inner walls of the fastening portion and the plugging portion gradually contract from the top portion of the fastening portion, and the locking mechanism surrounds and is further hooped at an outer wall of the fastening portion. According to the manufacturing method of the plugging head, a semi-vulcanized rubber material is injected to a chamber of a die, the rubber material is then heated till complete sulfuration is realized, pressurization molding is further carried out, after cooling, demolding is carried out. The plugging head is advantaged in that an oil leakage portion can be effectively plugged when oil leakage because of vibration of a high voltage switch mechanism device occursor oil leakage can not be stopped through power failure.