The invention relates to a tail gas treatment device, in particular to a multifunctional tail gas absorption tower. The multifunctional tail gas absorption tower comprises a tower body, a spraying device is arranged in the tower body, a tail gas inlet is formed in the bottom of the tower body, and an open tail gas outlet is formed in the top of the tower body; a liquid inlet is formed in the lower portion of the tower body, a liquid outlet is formed in the upper portion of the tower body, multiple layers of heat exchange pipelines are arranged between the liquid inlet and the liquid outlet in the tower body, and the heat exchange pipeline on each layer is circuitously arranged on one horizontal plane in an inner cavity of the tower body; at least two sets of heat exchange pipelines are arranged in the inner cavity of the tower body and are each arranged in a multi-layer mode, and the heat exchange pipelines, on all the layers, of one set and heat exchange pipelines, on all the layers, of the other set are alternated vertically, located on different horizontal planes and arranged in a criss-cross mode in the inner cavity of the tower body. According to the multifunctional tail gas absorption tower, dust settling is realized by means of a bent part arranged on the tail gas inlet, heat energy released by high-temperature tail gas can be absorbed by the heat exchange pipelines, and dust hanging on the wall, energy waste and absorption tower loss are avoided.