The present disclosure relates to the field of decor items, and more particularly relates to a pendulum unit and a wave pendulum assembly based on the pendulum unit, wherein the wave pendulum assembly comprises a frame and a plurality of first magnetic bodies, respective first magnetic bodies being connected to the frame via strings and being hung in the air; second magnetic bodies, the amount of which is identical to that of the first magnetic bodies, the second magnetic bodies being fixedly disposed below the first magnetic bodies in a one-to-one correspondence; in the first magnetic bodies and the second magnetic bodies, at least one party may generate magnetism when being energized, such that at least one of the first magnetic body and the second magnetic body may generate magnetism when being energized, such that the first magnetic body may swing periodically in the air under a magnetic action between the first magnetic body and the second magnetic body.. The wave pendulum assembly provided by the present disclosure has beneficial effects such as a simple structure, a good reliability, and an appeal for viewing.