All the Douluo Dalu books except the fourth took place only on the home planet. One of the many planets/planes within the universe. The birth place of spirit beasts and one of the many birth places of humanity. It is classified as a high-level plane because it was able to sustain life. Once made up of four continents and many islands, between SL and SL2, the Sun Moon Continent and the Douluo Continent collided with each other creating a single continent. The two remaining continents were occupied by the remnants of the Dou Ling Empire and the Star Luo Empire between SL2 and SL3 creating the Dou Ling Continent and the Star Luo Continent.
In the beginning, the planet had no land and only oceans. Land only appeared after the Dragon God settled on the planet for a period of time. It was there, the Dragon God created his first - generation children.
When the Douluo Divine Realm was created, the Dragon God took his clan and left the planet for the divine realm. During the God War in the Douluo Divine Realm, god aura and divine beast bloodline aura leaked out of the divine realm onto the Douluo Planet, causing spirit masters and spirit beasts to be born.
During the events of SL3, the planet was in danger of being devoid of life by another plane, the Abyssal plane. The reason for this was because of the rapid expansion of technology. It ended up depleting the natural resources on the planet and destroying the environment, causing the life energy of the planet to run dry. In the end, thanks to Tang San, Tang Wulin, and all the spirit masters and people who fought against the abyssal plane in soul land 3, the Douluo Planet was able to devour the energy from the abyssal plane, upgrading itself. This allowed spirit masters to break through to rank 100 and beyond and provide a lot of life energy for the planet.
In SL4, the planet became one of the few planets that has the most abundant life energy because of the large scale replanting of various plants and flowers.