A flexible cascade unit for cascading electrical elements and device thereof are provided. The cascade unit includes a first series connection portion, a second series connection portion and a flexible structure. The flexible structure is integrally formed between the first and second series connection portions, and has a first flexible rib and a second flexible rib. Each of the first and second flexible ribs respectively clads a conducting wire. Each conducting wire has two conducting ends respectively extended to the first and second series connection portions. As such, a flexible strip-like object can be formed, and be attached at an arm, waist or wrist of a person to be readily portable and wearable.