Manganese slag and recycled brick aggregates both belong to bulk solid waste. Improving the utilization rate of bulk solid waste has important environmental and economic benefits. In this paper, non-fired bricks were prepared using manganese slag and recycled brick aggregates, the effect of manganese slag content on various properties of non-fired bricks were investigated, and the microstructure and harmful substance leaching behavior were analyzed. The results show that the non-fired bricks have good appearance quality, uniform color and standard size. Combining strength requirements and frost resistance requirements, MU20 non-fired bricks with excellent strength, water resistance and durability are prepared when manganese slag content is less than 10% (mass fraction). MU15 non-fired bricks with excellent properties are prepared when manganese slag content is less than 15%. More ettringite hydrate phase is formed in the non-fired bricks, which is beneficial to strength development. The non-fired bricks made from manganese slag and recycled brick aggregates have good application effect in sidewalks and other municipal projects. The research results provide technical support for the low carbon resource utilization of manganese slag and production and application of ecological brick products.