A pet feces collection device includes a plate 1 having a through hole 10. Two ends of a strip 2 are connected to the two top wings 13, 14 of the plate 1. An adjustment unit 5 is movably connected to the strip 2. A left-leg belt 3 and a right-leg belt 4 are connected to the lower portion of the plate 1. Two connection members 35, 45 are respectively connected to two ends of the left and right leg belts 3, 4. An extension portion 16 extends from the periphery 70 of the through hole 10. Multiple clip portions 15 are formed around the through hole 10. A bag 7 is accommodated within the through hole 10 and the extension portion 16 and secured by the clip portions 15. The strip 2 is mounted to the pet 6, and the left-leg belt 3 and the right-leg belt 4 extend between the two rear legs 61, 62 of the pet 6. The plate 1 is positioned at the bottom of the pet 6 and the anus 65 of the pet 6 is located at the through hole 10.
