The present invention discloses a refinery rich gas absorption stabilization method, which comprises that 1) refinery rich gas is compressed and cooled, the cooled gas enters an absorption tower, the stream at the absorption tower kettle is conveyed to a desorption tower, and the gas phase at the tower top is conveyed to a re-absorption tower; 2) the obtained condensed liquid during the compression stage is collected and then is conveyed to a steam stripping tower, the gas phase at the steam stripping tower top returns to the inlet of the compressor, and the liquid phase at the tower kettle is adopted as the product so as to be extracted or is conveyed to a stabilization tower; 3) the gas phase stream at the desorption tower top is adopted as the product so as to be extracted, and the liquid phase at the tower kettle is conveyed to a stabilization tower; 4) the fuel gas is extracted from the re-absorption tower top, and the tower kettle liquid returns to the absorption tower so as to be adopted as the absorbent of the absorption tower; and 5) the liquefied gas is extracted from the stabilization tower top, C5 hydrocarbons are obtained from the tower kettle, one part returns to the absorption tower and the re-absorption tower so as to be adopted as the absorbent, and the other part is adopted as the product so as to be extracted. According to the present invention, the method has characteristics of simple process, easy operation and no requirement of separate equipment arrangement, and the concentrated gas being rich in C2 can be obtained.