Isolation packer

The utility model relates to an isolation packer which comprises a seat sealing mechanism, a locking mechanism and a sealing mechanism, and is characterized in that the packer is in threaded connection to a sand prevention pipe column through laevorotation buttress threads at the upper part of a central pipe and a casing pipe at the lower part; the interior of a piston sleeve of the seat sealing mechanism is in sealing threaded connection with the central pipe; the seat sealing mechanism is connected with a positioning pin for positioning; the inside and the outside of a piston are axially sealed with the piston sleeve and the central pipe; the piston and the piston sleeve are positioned axially; the locking mechanism further comprises an anti-rotation pin; copper rings are mounted on both sides of a rubber tube assembly of the sealing mechanism; a return ring is mounted outside of the copper ring on one side; an adjusting sleeve is fixedly connected with the central pipe through adjusting threads and the pos