The invention provides a cutting-free no-broken-yarn self-forming warp-knitted spacer fabric and a preparation method thereof, and relates to the field of warp-knitted spacer fabrics. The self-formingwarp-knitted spacer fabric is provided with shaping sewing areas, finished product effective use areas and transverse separation areas in the breadth direction, wherein the shaping sewing areas are located at the two ends of the self-forming warp-knitted spacer fabric in the breadth direction, and the transverse separation areas are located between the finished product effective use areas and theshaping sewing areas; the self-forming warp-knitted spacer fabric is provided with reserved edge covering areas, finished product effective use areas and finished product folding separation areas inthe weaving direction, wherein the reserved edge covering areas are located at the two ends of the self-forming warp-knitted spacer fabric in the weaving direction, and the finished product folding separation areas are located between the finished product effective use areas. During the production of the finished product of the spacer fabric, cutting is not needed, which can effectively reduce theproduction cost of the finished product; because the transverse separation areas and the finished product folding separation areas have no spacer yarns, no cut broken yarn falling phenomenon exists,and the discomfortableness generated after the human skin is in contact with residual broken yarns is effectively avoided.