The invention discloses a bulk additive distribution device. The device comprises a base bracket part (2), wherein a distribution part (7) is arranged on the base bracket part (2), and is provided with a spiral conveying device (8). The invention further discloses an operation method of the device. The device solves the problems of difficult control of adding quantity of bulk additives and great distribution difficulty of the bulk additives in even mixing with a sintering ore on a material layer, and quantitatively and evenly adds the bulk additives with functions of restraining sulfur decomposition or desulfurization into the appointed sintering material layer so as to reduce the emission of SO2 gas in the sintering production process. The device adopts an advanced control technology to realize the automation of adding the bulk additives on the appointed sintering material layer, is reasonable in technical scheme and convenient for operation, and improves the production efficiency.