The invention discloses a three-dimensional storage unit element, and the element comprises a multilayer laminated structure. The multilayer laminated structure comprises a plurality of conductive strips and a plurality of trenches, so as to define a first ridge-shaped lamination layer, a second ridge-shaped lamination layer, a third ridge-shaped lamination layer and a fourth ridge-shaped lamination layer. The element also comprises a first serial selection line switch located on the first ridge-shaped lamination layer; a first grounding selection line switch located on the second ridge-shaped lamination layer; a first U-shaped storage unit serial part which is in series connection with the first serial selection line switch and the first grounding selection line switch; a second serial selection line switch located on the third ridge-shaped lamination layer; a second grounding selection line switch located on the fourth ridge-shaped lamination layer; a second U-shaped storage unit serial part which is in series connection with the second serial selection line switch and the second grounding selection line switch. A first word line contact structure makes contact with the conductive strips of the first ridge-shaped lamination layer. A second word line contact structure makes contact with the conductive strips of the second ridge-shaped lamination layer. A third word line contact structure makes contact with the conductive strips of the third and fourth ridge-shaped lamination layers.