Abstract: A pet cage includes a plurality of side frames defining a containing space; the plurality of side frames at least includes a first side frame, a second side frame and a third side frame; a connecting pore is defined by the first side frame, the second side frame and the third side frame; and the connecting pore is communicated with the containing space. The pet cage further includes coupling assembly, wherein the coupling assembly has an assembled state and a disassembled state. When the coupling assembly is in the disassembled state, the coupling assembly is separable from the connecting pore; and when the coupling assembly is in the assembled state, at least part of the coupling assembly is located in the connecting pore. The first side frame, the second side frame and the third side frame are located and connected together through the coupling assembly.