Disclosed is a foldable pet cage frame, comprising an upper square frame, a lower square frame, and foldable supporting rod assemblies for connecting the upper square frame and the lower square frame. The upper square frame and the lower square frame are symmetrical, outer side pivot joint seats are arranged at the ends of transverse rods on one side of the upper square frame and the lower square frame, and inner side pivot joint seats are arranged on longitudinal rods on the other sides of the upper square frame and the lower square frame; and two ends of the foldable supporting rod assembly are respectively in pivot joint with the inner side pivot joint seats, and the other two ends of the foldable supporting rod assembly are respectively in pivot joint with the outer pivot joint seats. In a folded state, the foldable supporting rod assembly in pivot joint with the inner pivot joint seats is positioned on inner sides of the foldable supporting rod assembly in pivot joint with the outer pivot joint seats. The pet cage frame is convenient to fold, is small in size once folded, and is convenient to fold and unfold.
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