The invention discloses a disassembling, assembling and overhauling device and method of a curtain wall plate. The disassembling, assembling and overhauling device comprises a bracket consisting of ribbed slabs, wherein adjusting stabilisers are connected to the bottom of the ribbed slabs; a supporting platform is connected to the top of the bracket; a self-locking threaded jack is connected to the supporting platform, and comprises a threaded rod; a lifting hook component is connected to the lower end, penetrating through the supporting platform, of the threaded rod; an eccentric resistant movable sliding block is connected to the threaded rod; the eccentric resistant movable sliding block is in sliding connection with the bracket, and is arranged adjacent to the lifting hook component; and the bracket is in dismountable connection with a dismountable small supporting platform. According to the disassembling, assembling and overhauling device disclosed by the invention, the curtain wall plate of a plane roof or a curved surface roof can be quickly disassembled, lifted, mounted and reset, so that the roof is convenient to overhaul, the working efficiency is improved, and the labor security is improved.