The invention discloses a mounting device for a power cabinet element. The mounting device comprises a cabinet body. The cabinet body is provided with a first fixation block and a second fixation block. A drive motor is fixedly arranged in the first fixation block; a drive screw rod is arranged at the bottom of the drive motor in rotation connection; and the drive screw rod extends towards one side of the second fixation block and is in rotation connection with the second fixation block. Besides, a cooling device encircling the periphery of the drive motor is also arranged in the first fixation block and consists of cooling fins, a cooling fan, and a funnel groove. The drive screw rod is formed by a first screw rod and a second screw rod; and a first sliding block and a second sliding block are arranged at the first screw rod and the second screw rod respectively in a threaded connection manner. The mounting device has advantages of simple structure, convenient operation, precise docking, high stability and improved installation efficiency.