The sun is about to be destroyed, and humans have built huge thrusters on the surface of the earth to find a new home. However, the road to the universe is full of dangers. In order to save the earth, young people from the wandering earth era stepped forward for the third time and started a life-and-death battle against time.

Lee suffers from Time Perception Disorder (TPD), a rare psychological illness that makes one unable to judge the length of time. Lee holds a boring job and his biggest interest is to play video games. That is a hobby inspired by Lee’s uncle, who left Lee a mysterious video game disc. His uncle claims that anyone who beats the game would open the door of time travel. Lee’s life dramatically changed when Wang Qian steps into his life. Wang Qian also suffers from TPD so she understands Lee more than anyone else does. Their romance blooms and the two decide to be together. Unfortunately, tragedy strikes and the happy days end abruptly. Wang Qian is killed in a traffic accident after Lee quarrelled with her. Lee’s world collapses. Feeling extremely guilty and desperate, he suddenly comes up with a crazy idea: Beat the video game his uncle left, open the door to time travel and save his girl. From that point on Lee embarks on an amazing journey.

Humans built huge engines on the surface of the earth to find a new home. But the road to the universe is perilous. In order to save earth, young people once again have to step forward to start a race against time for life and death.

　　太阳即将毁灭，人类在地球表面建造出巨大的推进器，寻找新家园。然而宇宙之路危机四伏，为了拯救地球，为了人类能在漫长的2500年后抵达新家园，流浪地球时代的年轻人挺身而出，展开争分夺秒的生死之战 。该片以《流浪地球》版本的素材为主，新增了一点点新拍的素材。重映版比原版增加11分钟44秒2帧的内容。增加内容除了片尾花絮和旧素材，还补充了新视效新情节。该片包含了“心创作”、“心剪辑”、“心视效”、11分钟新内容全“心”版本的《流浪地球》。制片人龚格尔表示，此前《流浪地球》的时长是考虑到春节档，片长太长，则不利于排片。而2020年初的疫情让电影业暂停，团队就想着给它增加10多分钟的素材进去，这些素材片段把所有人物角色的前因后果都做了更充分的补充，有全新情节，还有一些新的视效。他还表示，新版将以公益的方式对院线和电影人做一些支持。

When the Sun begins to expand in such a way that it will inevitably engulf and destroy the Earth in a hundred years, united mankind finds a way to avoid extinction by propelling the planet out of the Solar System using gigantic engines, moving it to a new home located four light years away, an epic journey that will last thousands of years.