The utility model relates to a 230 diesel engine cylinder jacket which comprises a cylinder body and a cooling water cavity, wherein the cooling water cavity is arranged inside the cylinder body, and is naturally isolated during pouring. The integrative structure of the utility model enables the cylinder jacket to be simple in structure, simplifies the process technology, is convenient for processing and manufacture, improves the rate of finished products, reduces the cost, is more convenient to install and maintain, improves the sealing reliability of the cooling water cavity, and prolongs the service life.