Two decades before Douluo's final clash, the Soul Temple schemed to conquer the soul master realm, targeting the Seven-Treasure Glazed Sect first. Gu Douluo begged swordmaster Chen Xin to protect 5-year-old heir Ning Rongrong, unknowingly triggering a life-or-death flight that unraveled a continent-shaking conspiracy in shadows.

To win the three-year agreement with Nalan Yanran, the chief disciple of the Cloud Sect, Xiao Yan and Medicine Elder journeyed to the Snake Clan Desert to seek the legendary Heavenly Flame-the Green Lotus Core Flame, in order to enhance their strength. In the Snake Clan Desert, they became unexpectedly involved in the racial conflict between the human race and the snake people. The Snake Clan Queen, Medusa, was in seclusion to advance to the Dou Zong realm, providing Xiao Yan with an opportunity. Xiao Yan, together with Qing Ling and Mu Li, infiltrated the Snake Clan's underground palace. Coincidentally, Medusa fell into demonic possession due to absorbing the Heavenly Flame, allowing Xiao Yan to effortlessly obtain the coveted "Green Lotus Core Flame." Meanwhile, outside the city, a monumental racial war between the human race and the snake people was unfolding. With Xiao Yan's greatly enhanced strength, he thwarted the long-planned conspiracy of the snake people.

The film is the beginning of the entire story of Battle Through the Heavens; Xiao Yan, a talented young cultivator, to restore his Dou Qi and regain his dignity, with the guidance of "Yao Lao", leaves Wu Tan City alone and steps into the treacherous and dangerous Magical Beast Mountain Range, the beginning of the trial journey of searching for the Heavenly Flames to improve his cultivation.

After Xiao Yan and Yao Lao broke the battle between the Snake Human Clan and the Human Clan, they traveled with Qing Lin and Mu Li to enhance their strength. They won a three-year agreement with Nalan Yanran, the big disciple of the Yunlan Sect. When they arrived at the Tagore Desert, Qing Lin was unexpectedly abducted. In order to find Qing Lin, Xiao Yan and the others met the once-famous Ice Emperor Haibodong and then traveled to the Red Salt City. In the chaotic city, a black hand slowly revealed its true identity, intending to capture them all. Through Xiao Yan's persistent efforts, the truth about his mother's death during his childhood was gradually revealed.