In March 2025, the euro-dollar (EURUSD) exchange rate ushered in a historic moment, soaring by more than 2% in just three days, setting the strongest increase in 10 years. This drastic fluctuation has attracted widespread attention in the market, and behind it is the resonance of multiple factors. This article will analyze the deep logic of the euro's surge from the perspectives of monetary policy, economic fundamentals, geopolitical environment and market sentiment.