The invention provides a processing box. The processing box is detachably installed in an image forming device and comprises a toner bin for accommodating a developer; a developing roller; a driving force receiving component for receiving a driving force of the image forming device and driving the developing roller to rotate; a bracket, wherein the toner bin can be movably arranged on the bracketalong the axial direction of the driving force receiving component; and the processing box further comprises a toner bin displacement control component, wherein the toner bin displacement control component is arranged between a sidewall of the toner bin and the bracket, and the toner bin displacement control component can control the toner bin to move along the axial direction of the driving forcereceiving component. The processing box can control the toner bin and the developing roller to contact with or separate from a photosensitive drum on the image forming device, and meanwhile can control a driving force receiving head of the driving force receiving component on the processing box to extend out or shrink so as to engage or disengage with a driving part of the image forming device.