Small-diameter step-by-step unblocking and blocking water packer

The utility model belongs to the technical field of water plugging packers. The utility model relates to a packer, in particular to a small-diameter step-by-step unplugging water packer. The packer comprises an upper joint, a lower joint, a central pipe, a setting mechanism, an unsetting mechanism and a rubber sleeve assembly, the upper connector and the lower connector are arranged at the upper end and the lower end of the packer respectively. The central pipe penetrates through the center of the packer; wherein the rubber sleeve assembly is sleeved on the central pipe; the rubber sleeve assembly structurally comprises two baffle rings, two spacer rings and three sections of rubber sleeves, the two baffle rings are located at the two ends of the three sections of rubber sleeves which areconnected in series, the two spacer rings separate the three sections of rubber sleeves, the two ends of each section of rubber sleeve are vulcanized to the adjacent baffle rings or spacer rings respectively, so that the whol