民国初期，相传武当山有稀世宝藏，百年轮回一次的武林盛会即将开战，各路高手齐聚道教圣地武当山争当“天下第一”，神秘女子（杨幂 饰）使绝招抢夺大会战贴加入战局，表面上以武会友，背里却为一桩家族使命，而考古教授（赵文卓 饰）带着自幼习武的女儿，为传说中的镇山之宝混入武当；一名至孝的俗家弟子（樊少皇 饰)偶然成为了武当代表，与各地武术家争夺冠军,却不知陷入自张三丰创派后武当最大的危机中……In early Republican China, rumors were going around about the treasure in Wudang Mountain. An American conspirator took his well-trained kung fu daughter to Wudang by sponsoring a Taoist martial arts competition, to steal the treasure.