The invention provides an absorption stabilizing system and a working process and application thereof as well as a method for preparing stabilized petrol. The working process comprises the following steps: arranging a gas-liquid separator between a stabilizing tower feed heat exchanger and a stabilizing tower; arranging a gas phase inlet above an original feeding opening of the stabilizing tower, wherein the gas phase inlet is connected with the gas-liquid separator; self-pressing gas phase oil of the gas-liquid separator into the stabilizing tower through the gas phase inlet, and further self-pressing liquid phase oil of the gas-liquid separator into the stabilizing tower along the existing working process through the original feeding opening. By the working process, cold reflux of the stabilizing tower can be reduced, reduction in the cooling load at the top of the stabilizing tower and the reboiling load at the bottom of the stabilizing tower can be facilitated, and through a buffering action of the gas-liquid separator, the operation of the stabilizing tower can be smoothened.