Method for preparing composite material with three-dimensional reinforcement structure capable of improving the production efficiency of three-dimensional composite material preforms

The main purpose of the present invention is to provide a method for preparing a composite material with a three-dimensional reinforcement structure. The method is capable of improving the production efficiency of three-dimensional composite material preforms and, at the same time, improving the structure to increase the performance of the three-dimensional composite material in a harsh use environment. The method comprises the steps of: (1) using additive manufacturing technique to manufacture a first structure layer in a first direction, wherein the first structure layer includes a plurality of parallel lines; (2) using additive manufacturing technique to manufacture a first structure layer in a second direction, wherein the second structure layer is disposed above the first structure layer and the first direction is intersected with the second direction to form a structure layer plane angle; (3) repeating steps (1) and (2) to form a plurality of first structure layers and a plurality of second structure la