The invention discloses a method for repairing bricks at the bottom of a carbonization chamber of a large coke oven. The method comprises the following steps of: setting empty furnace number and blanking number, reinforcing furnace stays, controlling temperature of a vertical flue in a repairing area, performing gradual temperature reduction and forced temperature reduction on repairing number, setting a temperature keeping area and the repairing area in the carbonization chamber, repairing the bricks at the bottom of the carbonization chamber, heating the carbonization chamber, and detachingfurnace stay reinforcing facilities. The method has the advantages that: the bricks on a machine side and a coke side are repaired respectively, heat insulation is performed on the other side in the repairing period, repairing number adjacent carbonization chambers are subjected to empty furnace treatment, the stable temperature reduction can be realized, a repairing range is wide, and a problem that the bricks at the bottom of the carbonization chamber are cannot be repaired in a large area or a whole channel in the production process is radically solved; the repaired carbonization chamber has high thermal stability, can effectively resist thermal stress generated through temperature rise, and is safe and reliable, the service life is prolonged, furnace repairing frequency and time are reduced, the maintenance cost is reduced, and the smooth production of the coke oven is ensured; and severe environment of furnace repairing operation is improved, the construction is safe, and a burn accident is avoided.