The invention relates to the field of transformer installation equipment, and particularly relates to a current transformer installation method and a device for realizing the method. The current transformer installation method comprises the following steps: 1) at least two current transformers are combined on an overturning slip in a gesture with installation surfaces downward, and the current transformers are fixed together through a fixing device to form a current transformer module; 2) a switch device connector is installed on the current transformer module, and the switch device connector is installed in a condition in which the current transformer module turns over along with the overturning slip until the installation surfaces of the current transformers are in a vertical gesture and then the current transformer module leaves the overturning slip to avoid interference; 3) fixing on the current transformer module by the fixing device is relieved, and a busbar is installed on the current transformer; and 4) the current transformer module installed with the switch device connector and the busbar is installed onto a switch device. Thus, the problems that the present current transformer installation method is low in installation efficiency and is large in labor intensity and has hidden safety dangers can be solved.