A pet feces collection device includes a plate having a through hole. Two ends of a strip are connected to the two top wings of the plate. An adjustment unit is movably connected to the strip. A left-leg belt and a right-leg belt are connected to the lower portion of the plate. An extension portion extends from the periphery of the through hole. Multiple clip portions are formed around the through hole. A bag is accommodated within the through hole and the extension portion. The periphery of the opening of the bag is secured by the clip portions. The strip is mounted to the pet, the left-leg belt and the right-leg belt extend between the two rear legs of the pet and are connected to the strip. The plate is positioned at the bottom of the pet and the anus of the pet is located at the through hole.
