The invention discloses a semiconductor memory and a manufacturing method thereof. The semiconductor memory comprises at last two memory chipsets stacked successively from bottom to top, re-wiring layers of two adjacent memory chipsets are electrically connected with inter-layer conductive poles, and a re-wiring layer of the bottommost memory chipset is electrically connected with external connecting projections; and each memory chipset comprises at least two memory chips stacked successively and a composite insulating layer positioned under the memory chips, the memory chips are packed into an integrated structure, the re-wiring layer is arranged in the composite insulating layer, and intra-layer conductive poles of the memory chips are staggered from each other for a preset angle, and are electrically connected with the re-wiring layer. According to the invention, large capacity and high integrated degree of the semiconductor memory are realized, the stacking efficiency of the memory is improved effectively, and the stacking difficulty is reduced.