In today's global economic system, the digital economy is reshaping the map of international trade at an unprecedented speed and scale, becoming a key force driving global economic growth and transformation. Based on this background, this work comprehensively analyzes the development policies and temporal and spatial characteristics of the digital economy, discusses the multi-dimensional impact of the digital economy on the high-quality development of export trade from the perspectives of growth, technology and green, and puts forward key policy suggestions. At the same time, it evaluates the international competitiveness of China's digital trade, discusses the impact of international rules and cooperation paths, especially the current situation and future of China-Asean digital economic cooperation. This work not only enriches the theoretical system of digital economy and international trade, but also provides valuable decision-making reference for policy makers. The highlight lies in its cross-perspective systematic analysis and in-depth insight into international cooperation.