Transition metal oxide trimanganese tetraoxide has been widely utilized in the field of energy storage, particularly in the battery industry, due to its distinctive structural characteristics and physicochemical properties. In recent years, the battery industry has placed higher demands on the product quality of trimanganese tetraoxide, with product tap density being one of the key factors affecting battery material performance. Its magnitude directly impacts the energy density, power density, and safety performance of the battery, while better tap density also contributes to enhancing the battery's cycle stability. During the study, it was found that the roasting system had a significant influence on the tap density of the roasted products. Therefore, to enhance the tap density of trimanganese tetraoxide, this study employed high-purity manganese sulfate as the raw material and ammonia as the precipitating agent to prepare trimanganese tetraoxide with high tap density through the precipitation-roasting method of manganese sulfate solution. The effects of precipitation reaction parameters and thermal system on the tap density of trimanganese tetraoxide were explored, and the morphology, structure, and composition of manganese trioxide products were characterized. The experimental results indicated that under the optimal process conditions, with an ammonia-to-manganese ratio of 3:1, a manganese sulfate concentration of 2.0 mol/L, a roasting temperature of 1150℃, a roasting time of 4 hours, and a forced ventilation roasting atmosphere, the best outcomes were achieved. Under these conditions, the manganese content of trimanganese tetraoxide was 71.91wt%, with a D50 of 10.723 μm and a specific surface area of 1.786 m2/g, exhibiting a spherical morphology. The content of trace elements met the requirements, and the tap density was 2.85 g/cm3, meeting the industry standard for high-purity trimanganese tetraoxide.