The invention provides a mobile elastic busbar for a power distribution device, which includes: a main conductor, one end of which is connected to the main switch of the power distribution device; at least two sub-conductors, one end of which is connected to the sub-switch of the power distribution device , the other end of the sub-conductor can be moved on the main conductor with a predetermined clamping force, and the joints between the sub-conductors and the main conductor of the same phase are collinear. The present invention also provides a power distribution device, which includes a housing, a main switch, at least two sub-switches and the above-mentioned movable elastic busbar for the power distribution device, the main switch and the sub-switches are fixed in the housing, and the movable elastic busbar Connected between the main switch and the branch switch. The present invention also provides a power distribution device, which includes a main switch, at least two sub-switches, and the above-mentioned movable elastic busbar for the power distribution device connected between the main switch and the sub-switches. The position of the sub-conductor of the invention can be adjusted according to the requirements of the wiring port, the contact is stable and reliable, and the installation and disassembly are simple and convenient.