The utility model relates to a dismounting device for a sealing sleeve of an oil extraction centrifugal pump. The technical scheme is as follows: a movable plate is arranged on the fixed bottom plate;a fixed rod is integrally arranged at the upper part of the movable plate; a lower fixing lantern ring is welded at the lower part of the fixing rod; a middle fixing lantern ring is welded to the middle of the fixing rod. An upper fixing lantern ring is welded at the upper part of the fixing rod; a fixed outer threaded sleeve is welded to the lower portion of the fixed bottom plate, a spiral topsleeve is arranged on the inner side of the fixed outer threaded sleeve, an inner blocking ring is integrally arranged on the inner side of the bottom of the fixed outer threaded sleeve, an outer blocking ring is integrally arranged on the outer side of the bottom of the fixed outer threaded sleeve, and the inner blocking ring and the outer blocking ring are connected with the spiral rod through bearings. The disassembling tool has the advantages that the mechanical sealing sleeve of the oil extraction centrifugal pump can be disassembled conveniently and rapidly, the mechanical sealing sleeveof the oil extraction centrifugal pump can be disassembled through drawing force, the problem that an existing single drawing rod is prone to breakage can be solved, and the disassembling tool is wide in application range.