The utility model discloses a cylinder sleeve for an internal-combustion engine, which belongs to the technical field of internal-combustion engines. The cylinder sleeve comprises a cylinder sleeve body, wherein a bearing shoulder is arranged at the top of the cylinder sleeve body; the cylinder sleeve body is provided with a location belt below the bearing shoulder; the cylinder sleeve body is provided with a first groove used for forming a bottom cooling water cavity with the cylinder body of the internal-combustion engine below the location belt; a second groove used for forming a top cooling water cavity with the cylinder body of the internal-combustion engine is formed in the location belt and close to the bearing shoulder. The cylinder sleeve disclosed by the utility model is capable of realizing efficient cooling for the top thereof, and improving the reliability of the internal-combustion engine.