The utility model discloses a high voltage relay which comprises an insulating casing, a drive cylinder, a drive swing rod, a swing connecting rod, and a group or more relay contact units, wherein each group of relay contact units comprise a movable sheet, a movable sheet contact, a normally closed contact, and a normally open contact; the drive cylinder, the drive swing rod, the movable sheet contact, the normally closed contact, and the normally open contact are evenly arranged on the insulating casing; one end of the drive swing rod is connected with a piston shaft of the drive cylinder; the other end of the drive swing rod is connected with the swing connecting rod; the movable sheets are evenly arranged on the drive swing rod; the movable sheet contact is connected with each movable sheet, and the movable sheet can respectively contact with the normally closed contact and the normally open contact at different angles. The utility model uses compressed air drive. The utility model has the advantages of simple structure and high insulating ability. Tens of thousands of volts of high voltage can be endured among leading-wire contacts.