The utility model discloses a mechanical sealing and dismantling tool dedicated for a polymeric kettle. The mechanical sealing and dismantling tool dedicated for the polymeric kettle comprises two sliding rods arranged in parallel. A transverse rod is arranged between the two sliding rods. Support legs are arranged under the sliding rods. The mechanical sealing and dismantling tool dedicated for the polymeric kettle is simple in structure, convenient to use and capable of reducing labor intensity for workers, improving working efficiency and preventing accidents.