"The Wandering Earth" is a movie about a group of people trying to save the planet Earth. They do this by strapping rockets to the planet and blasting it off into space.
See, the Sun is going to explode and destroy everything in its path, so in order to save Earth, they need to move it to a new home. But it's not easy to move an entire planet - it's pretty heavy, like a giant boulder.
That's why they use special engines to push and pull Earth through space like a giant ship. Along the way, they also have to steer around asteroids and other obstacles that could hurt the planet or the people on it.
It's like when you play with toys and move them around a room, except instead of toys, it's a whole planet! It's a really exciting, but also kind of scary, adventure.