The utility model relates to a sleeve plug which comprises a plug body; a cavity is communicated with the top of the outer shell of the plug; and at least two connectors are arranged on the wall of the cavity. Three connectors, i.e. an emptying connector, a sampling connector and a pressure release connector, are arranged on the outer shell of the cavity in a radial way, and the spacing between adjacent connectors is no less than 90 degrees; and a watered connector is axially arranged on the outer shell of the cavity. By adopting the structure, the sleeve plug is easy to install and saves materials; two through holes are arranged on the outer side of the outer shell; each through hole is communicated with one cavity of a corresponding sleeve; one end of each sleeve which is over against the through hole is respectively and rotationally assembled with the sampling connector and the pressure release connector, so that work tasks, such as the watering of the sleeves, the emptying of the sleeves, the gas release of the sleeves at fixed pressure, the intake of sleeve pressure and the like can be realized.