The story is adapted from the famous World War II military event "Dunkirk Evacuation". At the beginning of World War II, 400,000 British and French allied forces were besieged on the beaches of Dunkirk by the enemy. Facing the desperate situation of the enemy approaching step by step, the situation was extremely critical. The British government and the navy mobilized a large number of crew members to mobilize the people to rescue the army. British soldier Tommy (Fionn Whitehead) met Gibson and Alex one after another in the process of escaping from the beach. At the same time, civilian ship owner Mr. Dawson (Mark Rylance) and his son Peter and 17-year-old George also left Britain to rescue soldiers in Dunkirk. The three rescued the navy (Cillian Murphy), pilot Collins and Tommy, while fighter pilot Farrell (Tom Hardy) fought tenaciously under the difficult situation of being attacked by the enemy on both sides. The story of the film is told from three perspectives: land, sea, and air. Surrounded by the German army, everyone has to fight for their own destiny in order to have a chance to return home alive.