Ferrous sulfate is a mineral feed additive widely used in the feed industry. Iron is the element that makes up hemoglobin Myoglobin, cytochrome, and various oxidases are important components, and have detoxifying effects on the toxin gossypol contained in cottonseed cake from pigs, chickens, and other sources. Therefore, determining its content will provide necessary basis for feed ratio. This article refers to the national standard and adopts potentiometric titration The method has improved the determination of ferrous sulfate content, avoiding errors caused by color judgment and resulting in more accurate and reliable results.