An absorption/desorption purification system promoting condensation recovery efficiency includes an absorption/desorption device, a concentrated volatile organic compounds conveying pipe, a humidifier and a condensing device; the absorption/desorption device is used for adsorbing volatile organic compounds contained in conveyed to-be-purified gas flow and then discharging purified gas flow, and concentrating and desorbing the adsorbed volatile organic compounds; the concentrated volatile organic compound conveying pipe is connected between the absorption/desorption device and the condensing device; the humidifier is arranged inside the concentrated volatile organic compound conveying pipe and used for spraying water mists to the passing concentrated volatile organic compound gas flow to increase the humidity; the condensing device is used for condensing humidified concentrated volatile organic compound gas flow to generate a condensation liquid containing the volatile organic compounds. The absorption/desorption purification system is used for solving the problem of ineffective effects for condensation recovery of volatile organic compounds in the prior art, and has the efficacies of promoting the condensation recovery efficiency of the volatile organic compound and saving energy.