Regeneration method of rare earth-based SCR denitration catalyst

The invention belongs to the technical field of denitration catalyst regeneration, and particularly relates to a regeneration method of a rare earth-based SCR denitration catalyst. The method comprises the following steps: (1) removing fly ash and ammonium bisulfate, and cleaning pore channels: putting a deactivated catalyst into a cleaning kettle, adding water to immerse the catalyst, and adding a cleaning agent; (2) starting steam heating, and controlling the pressure in the kettle; (3) cleaning: cooling, opening a discharge valve at the bottom of the cleaning kettle, and discharging the cleaning liquid; pumping pure water to wash the catalyst, and enabling the pure water in the kettle to immerse the catalyst; (4) heavy metal removal: adding a saturated rare earth solution to immerse the catalyst; (5) adding organic acid for reaction; (6) after the reaction is finished, adding an adsorbent; (7) cleaning: pumping pure water to clean the catalyst; and (8) drying: drying the catalyst in a vacuum drying oven to