Modified fabricated building novel sandwich thermal insulation external wall panel

The utility model relates to the technical field of thermal insulation external wall panels, and discloses a modified fabricated building novel sandwich thermal insulation external wall panel which comprises an outer wall, an XPS thermal insulation board is arranged on the rear side of the outer wall, an inner wall is arranged on the rear side of the XPS thermal insulation board, and a fixing mechanism is arranged in the XPS thermal insulation board. According to the modified fabricated building novel sandwich thermal insulation external wall panel, through the arranged fixing mechanism, a worker only needs to rotate a screw head to drive a bolt to be disengaged from the connection relation with a positioning rod to complete the disassembly work of the sandwich thermal insulation external wall panel, and the worker can conveniently assemble and disassemble the sandwich thermal insulation external wall panel; when one of the outer leaf wall, the XPS heat preservation plate or the inner leaf wall is damaged and