Strong demand for renewable energy resources and clean environments have inspired scientists and researchers across the globe to carry out research activities on energy provision and conversion, as well as storage devices. In this context, development of outperform, stable, and durable electrocatalysts has been identified as one of the major objectives for oxygen evolution reaction (OER) at low overpotential. Herein, we offer facile approach for the deposition of few palladium oxide (PdO) nanoparticles on the cobalt-nickel bi-metallic sulphide (CoNi2S4) microstructures as PdO@ CoNi2S4 using ultraviolet light irradiation. The morphology, crystalline structure, and chemical composition of the as-prepared PdO@ CoNi2S4 composite were probed through scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), high resolution transmission electron microscopy (HR-TEM), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) techniques. The combined results revealed that UV light promoted the facile deposition of PdO nanoparticles of 10 nm size onto the CoNi2S4 and the fabricated PdO@ CoNi2S4 composite has remarkable activity towards OER in alkaline media. Significantly, it has shown a low onset potential of 1.41 V versus reversible hydrogen electrode (RHE) and a low overpotential of 230 mV at 10 mAcm-2. Additionally, the PdO@ CoNi2S4 composite was found stable for 45 h. Electrochemical impedance spectroscopy (EIS) has shown that the PdO@ CoNi2S4 composite has a low charge transfer resistance of 86.3 Ohms, which favors the OER kinetics. The PdO@ CoNi2S4 composite provided the multiple number of active sites, which favoured the enhanced OER activity. This new class of material could be investigated towards potential applications in overall water splitting, energy storage and conversion applications.