The cat tree is designed with 4 layers, the bottom layer is sturdy and has a strong center of gravity, and the second and third layers are for amusing cat balls for cats to play with. The fourth platform is a cat box with built-in plush stuffing for cats to rest and relax. Scratching posts for cats to sharpen their claws and avoid damage to furniture, carpets, and others. From many aspects considering the dynamic behavior of cats, this can provide a safe, entertaining, and relaxing space for cats.