A pet feces collection bag comprises a carrier plate, a handle portion, and a bag. The handle portion, formed as a frame structure, is coupled to two corresponding sides of a periphery of the carrier plate and extends outward therefrom thereby defining the carrier plate into a front part having a first predetermined length and a rear part having a second predetermined length along a specific direction, wherein the first predetermined length is smaller than the second predetermined length. The bag is connected to peripheries of the handle portion and the rear part by a predetermined connection manner. The handle portion is operated to rotate around the carrier plate within 360 degrees about a specific axis whereby an opening of the bag is selectively to be opened or closed. The carrier plate and the handle portion are formed as one-piece unit.
