Poly manganese tetra (o-amino phenyl) porphyrin (MnTAPP)-nano Au film was electrodeposited on glassy carbon electrode (GCE) and indium tin oxide coated glass electrode (ITO) using cyclic voltammetry (CV). Electrodeposited poly MnTAPP-nano Au modified electrodes have been characterized using scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. Poly MnTAPP-nano Au film modified GCE found as electrochemically active and stable. Poly MnTAPP-nano Au modified GCE employed for the amperometric detection of sodium hypochlorite (NaOCl) in the linear range of 24 × 10⁻⁶–1.07 × 10⁻² M. The proposed film holds the capacity to overcome the interference substances and showed the reduction current response for the NaOCl additions. In addition, the poly MnTAPP-nano Au film successfully exhibits the reduction current of NaOCl concentrations in the commercially available bleaching liquids, respectively.