The invention discloses a chinchilla pet cage ensuring large-range activity. The chinchilla pet cage comprises a pet cage body, wood shelf boards are arranged in the pet cage body and located at the side edges of the pet cage body, metal supports are arranged under the wood shelf boards, the ends of the metal supports are fixed to the side edges of the pet cage body through bolts, the surfaces ofthe metal supports are fastened to the wood shelf boards through screws, climbing frames are arranged on the upper surfaces and the lower surfaces of the wood shelf boards, and each climbing frame isformed by combining a guiding rod arranged longitudinally and supporting lining rods transversely arranged on the guiding rod at equal intervals. The chinchilla pet cage is simple in structure, convenient to use, high in stability, free of noise, safe and harmless, and rich building structures are provided for play of chinchillas.