Method for decreasing emission of sulfur dioxide in thermal power plant by utilizing waste molasses

The invention provides a method for decreasing the emission of sulfur dioxide in a thermal power plant by utilizing waste molasses, which can be used for solving the problem in the prior art that the waste molasses cannot be effectively utilized. According to the technical scheme, the method comprises the following step: adding a saccharic acid accounting for 300ppm to 6000ppm of the weight of total molasses into a desulfurization tower of a thermal power plant, wherein the saccharic acid is obtained via the reaction between the waste molasses and an oxidizing agent. The saccharic acid oxidized by a chloric acid is directly taken as a desulfurization synergist, so that the desulfurization efficiency is improved by more than one percent; and the emission of the sulfur dioxide from the thermal power plant into atmosphere is reduced by 20% to 30% or so every year.