A foldable bag frame and a pet bag using same are presented. The foldable bag frame includes four top support bars connected end-to-end in sequence, four bottom support bars connected end-to-end in sequence, and connecting rods. Each of the connecting rods consists of two hingedly-connected short-segment connecting rods. The foldable bag frame further includes a sleeve slidable along the connecting rod, and a spring fixedly connected to one end of the sleeve and sleeved over an outer side of the connecting rod, the other end of the spring being connected to the non-fixed end of a short-segment connecting rod. When the spring is in an initial state, the sleeve connected thereto covers the hinged portion of the connecting rod. By controlling foldability of the connecting rods, folding of the frame is conveniently achieved, making it possible to use a strong rigid material for the frame to meet stability during use.
