The invention provides a method for replacing a lifting oil cylinder of a ladle turret. The ladle turret comprises a base, wherein the lifting oil cylinder and a cover arm are arranged on the base. The method comprises the specific steps that a butt joint device is connected with the cover arm in a matched mode, the lifting oil cylinder is lifted and moved out through an electric hoist, and a newlifting oil cylinder is moved thereinto and installed. According to the method, the lifting oil cylinder is replaced through the butt joint device, the construction period can be greatly shortened under the condition of guaranteeing the quality and safety, and a large amount of labor cost is saved.