Electroplating industries generate wastewater containing acidic residues, dissolved metals, and suspended impurities that require neutralization before safe discharge. Conventional effluent treatment plants are generally designed for larger industries and are often difficult for small and medium enterprises (SMEs) to adopt because of higher cost, greater space demand, and operational complexity. This paper presents the design of a compact smart waste neutralization system intended for SME electroplating units. The proposed system integrates a collection tank, treatment tank, neutralizing-agent tank, pH sensing, level monitoring, automated dosing, and agitation-assisted mixing under microcontroller-based control. The study focuses on system architecture, control logic, and design suitability for decentralized wastewater handling. By emphasizing compactness, process simplicity, and reduced manual intervention, the proposed design offers a practical approach for improving neutralization consistency in small-scale industrial environments. The work contributes a control-oriented and application-focused framework that can support future development of affordable wastewater neutralization solutions for SME electroplating sectors.