Abstract: An inflatable active packer includes: an inner steel pile; and a sleeve coaxially disposed outside the inner steel pile. The inner diameter of the sleeve is larger than the outer diameter of the inner steel pile. The length of the sleeve is less than or equal to the length of the inner steel pile. The sleeve includes an inner wall, and one end of the inner wall is provided with a guide lug. A strengthened clamping layer is attached to the inner wall of the sleeve. A rubber capsule is fixedly disposed in the middle of the strengthened clamping layer; two ends of the strengthened clamping layer are fixedly connected to the sleeve through a compression member. A mounting hole is disposed in the middle of the strengthened clamping layer. The sleeve includes a through hole coaxially with the mounting hole.