The hydraulic cylinder of the shield machine is an important execution element in the hydraulic system of the shield machine. It works in harsh environments such as severe gravel, mud, dust erosion, high pressure, continuous operation and extremely large load-bearing capacity. It has high requirements for the sealing, support form and anti-load-bearing capacity of the oil cylinder. The performance of hydraulic cylinders is directly related to the working quality and efficiency of the shield machine. Keent uses the important experience accumulated over the years in the field of hydraulic cylinder manufacturing to develop a shield machine hydraulic cylinder suitable for shield machine use through technical upgrades.