The invention discloses a controllable lifting live crossover device which comprises a travelling lifting mechanism, wherein a support rolling mechanism is arranged on the walking lifting mechanism; the walking lifting mechanism is a crane; the end part of a lifting arm of the crane is provided with a pulley frame and a pulley; the pulley frame is provided with a movable opening; two sides of the pulley frame are respectively provided with two special pulleys for an insulation net; and the lifting arm of the crane is provided with a pull wire connected with a ground anchor. The controllable lifting live crossover device and has the advantages that the device is applicable to various voltage classes, and all kinds of crossover objects, such as roads, highways, railways, etc., and is convenient and rapid; and great labor force and physical resources are saved greatly; the engineering construction cost is lowered; the damaged arable lands in construction and common land occupation are reduced in construction; and the method is a construction method which is worth being popularized.