Variable-density three-dimensional fabric and weaving method thereof

The invention discloses a variable-density three-dimensional fabric and a weaving method thereof. The density of the three-dimensional fabric changes in one of the thickness direction, the width direction and the length direction or changes in two or more of the thickness direction, the width direction and the length direction at the same time; the variable-density three-dimensional fabric is connected through a layer connection structure; interface layers of different density areas are connected with each other, and yarns are continuous; and the whole body is formed by continuous weaving. The variable-density three-dimensional fabric has the advantages of being diversified in weave structure, large in fabric size control range, high in designability, compact in structure, good in integrity, simple in weaving process, suitable for continuous weaving and the like; and a variable-density material compositely reinforced by the fabric has the advantages of low thermal expansion coefficient, high heat resistance,