本片是迪士尼第36部经典动画《花木兰》衍生剧情,当花木兰(温明娜 配音)和李翔准备完婚之际,他们却突然接到一份密旨:为了抵抗强大的匈奴,护送三位公主下嫁和番,维持边疆和平。于是他们立即启程动身,插科打诨的木须龙和蟋蟀当然也一起跟来。但是在途中木兰发现公主们其实不愿外嫁异族,更糟糕的是居然还爱上了别人,这别人正是上次立功而久久被别的女孩拒绝的三个护卫。一向崇尚女子自由意志的木兰,因此决定冒杀头大罪的危险帮助公主逃跑,已经都快到番邦边境,所护驾的公主们却失踪,这样的发展实在超出李翔的意料之外,更出乎意料的是,木须竟然为了自己的权益而挑拨木兰和李翔的关系。在路上,李翔出现意外,为了救木兰而坠下深谷,木兰将会怎么完成自己的任务和拯救自己的心上人呢……Fa Mulan gets the surprise of her young life when her love, Captain (now General) Li Shang asks for her hand in marriage. Before the two can have their happily ever after, the Emperor assigns them a secret mission, to escort three princesses to Qui Gong, China. Mushu is determined to drive a wedge between the couple after he learns that he will lose his guardian job if Mulan marries into the Li family. After the princesses unexpectedly fall in love with the Gang of Three, Mulan decides to help them escape the fate of marrying men they do not love. This contradicts the Emperor's orders and forces him to put Mulan's relationship with Shang into question. They are attacked by Mongolians, and the fate of China hangs in the balance.