The invention relates to the field of 
petrochemical gas treatment, and discloses an alkali liquor oxidation regeneration 
tail gas cleaning treatment and reutilization method and 
system. The method comprises the steps that a, 
tail gas of an alkali liquor oxidation regeneration 
tower passes through an adsorption tank containing an adsorbent from bottom to top, N2, H2O and 
hydrocarbon in the 
tail gasare removed, and 
oxygen extraction concentrated gas is obtained; b, the 
oxygen-extracted concentrated gas is subjected to 
settling separation by an 
oxygen-extracted concentrated gas liquid separationtank to obtain liquid, and the liquid is boosted by a 
supercharger and sent to a 
gas cooler for cooling; c, the cooled 
oxygen extraction concentrated gas is mixed with external factory air in a mixerto obtain 
mixed gas; d, the 
mixed gas is returned to an air inlet in the lower part of the alkali liquor oxidation regeneration 
tower through an on-line analyzer; and e, when the adsorption of the adsorbent in the adsorption tank is saturated, the adsorption tank is desorbed, and desorbed gas is sent to a 
gas cabinet gas collection header 
pipe. By adopting the method and the 
system, the situationthat alkali liquor oxidation regeneration tail gas treatment seriously depends on 
combustion treatment of an incinerator or a 
heating furnace can be changed, and clean production and flexible arrangement are realized.