A pet bag rack, comprising horizontal bars and two groups of relatively disposed side bars. One end of each group of the side bars is hinged to one end of the horizontal bars, and the other end of the side bars is pivoted to a pivot seat. The side bars may rotate around the pivot seat a limiting and fixing device comprising a revolving shaft, a knob and a limiting turntable is mounted on the pivot seat. The revolving shaft runs through the center of the pivot seat. The knob is arranged at the inner end of the revolving shaft. The limiting turntable is slipped over the revolving shaft.
