《火力全开》主要描述了王力宏火力全开演唱会从台前幕后准备到成型再到演出的全纪实，并且在其中穿插很多他从小到大的励志往事，还首次对于其妻子对外进行曝光。《火力全开》记录的不只是一场表演，更记录了这场演唱会从筹备到完成的思想和精神。这部电影忠实记录华语流行演唱会在现今的状态，并呈现出王力宏的音乐创作概念与历程、舞台下平易近人又生活化的一面，以及对梦想的坚持和发光。无论观赏《火力全开》3D电影的观众们是不是王力宏的歌迷，都能从中一窥音乐之于世界的力量，成为东西文化交流的种子。

Famous from an incredibly young age, DMH (Wang Lee Hom) has only ever known a celebrity pop star existence. Yet, despite all the glamour, there is still something lacking in his charmed life - true love. With the help of fellow musician and friend WZB, DMH disguised himself as a regular Joe in the hope of finding true love. While incognito, DMH and WZB stumble across the performance of a classical Chinese orchestra and DMH is immediately captivated by the melodies of the guzheng soloist, LMQ (Crystal Liu Yi-Fei), a student at the Shanghai Conservatory, whose affections lie with the accomplished but arrogant virtuoso, ZXZ. In his attempt to spend more time with LQM, DMH promises to help LQM get together with ZXZ. As DMH and LQM grow closer, it becomes increasingly difficult to conceal his identity.