A pet stroller includes a supporting frame and a foldable access ramp assembly, wherein the supporting frame includes a supporting platform for a pet lying thereon. The foldable access ramp assembly, which is provided at the supporting frame, includes a ramp member slidably coupled at the supporting frame and being moved in a storage position that the ramp member is supported underneath the supporting platform, and an extension position that the ramp member is slid out frontwardly to extend from the supporting platform for the pet easily accessing in-and-out from the supporting platform.
