The KZ series water injection wellhead device is composed of Christmas tree and tubing head. It is designed and manufactured according to the SY5127-2002 standard and API spec6A standard. It has the functions of positive and negative water injection, positive and negative well washing, and water injection test. All pressure-bearing parts and flanges are made of high-quality alloy steel forgings, with simple structure, light weight, and convenient installation and disassembly.