The invention relates to a machinery device, and specifically relates to a device for transporting and docking nuclear facilities in a confined space. The device comprises a roller transportation device, a right angle transportation device, a first movable trolley, an unpowered transportation device, a second movable trolley, a cross arm robot, a docking passage and a docking trolley. The roller transportation device, the right angle transportation device, the first movable trolley, the unpowered transportation device, the second movable trolley, the cross frame robot, the docking passage and the docking trolley are arranged sequentially. The device solves the problems of transportation and docking of large-scale nuclear facilities when the large-scale nuclear facilities need to pass through multiple isolation gates in the confined space.