The utility model discloses a novel trinity multi-functional flue gas desulfurization tower has set gradually tower cauldron section, quench zone, filler section, heat transfer section and chimney section from tower bottom to the top, set up flue gas inlet on the upper portion of tower cauldron section, is provided with spray set in the heat transfer section, is provided with the rapid cooling nozzle on quench zone upper portion. Compared with the prior art, the utility model has the advantages that: the utility model discloses multi-functional trinity tower can be handled concentration and at the flue gas containing sulphur of 3000-25000mgm3 within range, realize rapid cooling, desulfurization dust removal, three kinds of functions of smoke stack emission in the processing of an organic whole in same tower, and application scope is wide, and desulfurization efficiency owing to collect some functions in an organic wholes, has greatly reduced area up to more than 95% simultaneously. This tower packing adopts a novel filler, has characteristics such as the resistance is little, the mass transfer is effectual, the absorption efficiency is high, the gas-liquid distribution is even, is favorable to the desulfurization of high concentration sulfur dioxide flue gas to be absorbed.