The invention provides a regeneration system and a regeneration method of an adsorbent in coke oven smoke purification. The system comprises an analysis tower, a screening device, a purifying device,an ammonium sulfate treating section and a coke oven, a regenerated adsorbent discharging port of the analysis tower is connected with the screening device, the inside of the analysis tower is dividedinto a heating section and a cooling section, a heat source inlet of the heating section is connected with a heat source generation device while a heat source outlet of the same returns to the heat source generation device, and a cold source inlet of the cooling section is connected with a cold source; an analysis gas outlet of the analysis tower is connected with the ammonium sulfate treating section and the coke oven. The adsorbent is analyzed in the analysis tower, concentrated gas of SO2 is formed through purging, and residual gas is fed into a burning chamber of the coke oven to serve asfuel to be utilized after going through an ammonium sulfate working section for desulfurization. Activated carbon after analysis participates in smoke purification again after analysis, and powder residue which is screened down is used for water treatment and coal blending for coking. By the regeneration system and the regeneration method, no difficult-to-treat three wastes and harmful substancesare generated, and clean and efficient coke oven smoke governance is realized truly by combining with the smoke purification process.