The invention relates to the field of electroplating equipment, and discloses a rotary sealing structure in a strong acid or strong alkaline environment. The rotary sealing structure comprises a sealing plate, an avoiding hole in the sealing plate, a conductive mandrel which is rotatably matched with the avoiding hole, and a rotary sealing structure body arranged between the avoiding hole and theconductive mandrel, wherein the rotary sealing structure body comprises a fixed ring which is sealed and welded in the avoiding hole and is in clearance fit to the conductive mandrel after interpenetrating the conductive mandrel, a first sealing ring which is embedded into the fixed ring and is in interference fit to the conductive mandrel, and an extruding part which is arranged at one end away from the sealing plate and abuts against the first sealing ring; the extruding part comprises a matching ring and an extruding ring which extends in a concentric mode from one side close to the fixed ring and is in abut-again matching with the first sealing ring; and an extruding structure for pressing the extruding ring to the first sealing ring is arranged between the matching ring and the fixedring. The rotary sealing structure can effectively prolong the service life of the first sealing ring; and the first sealing ring can have sealing performance without changing the first sealing ring which is generally deformed.