This poem comes from Kong Shaode's Fallen Leaves: Leaves fall in early autumn, like guests. If you don't want to go down, cherish the old forest.
Poetry means:
Autumn has come, and suddenly I find that the leaves have fallen, and I feel lonely, just like a wanderer in a different place. Seeing the leaves floating everywhere, I think of my distant hometown, homesick, homesick!
This poem uses a metaphor: the poet doesn't use flying leaves that don't want to leave the old forest to describe the urgency of returning home after leaving his hometown, but says "falling like a guest" and uses visitors who miss their hometown to describe leaves that don't want to fall to the ground.
I hope my answer will satisfy you. )