A process cartridge detachably mountable in an image forming apparatus includes a toner cartridge for accommodating a developer; a developer roller; and a driving force receiving assembly for receiving a driving force of the image forming apparatus and driving the developer roller to rotate; and further includes a first stopper and a second stopper provided at a bottom of the toner cartridge, and the first stopper and the second stopper being movable relative to the toner cartridge in a direction perpendicular to an axial direction of the driving force receiving assembly; and when the first stopper and/or the second stopper move, a driving force receiving head of the driving force receiving assembly is movable in an axial direction of the driving force receiving assembly. The process cartridge can realize separation and contact between a developer roller and an image forming apparatus.