The CeO2 and CrO4-CeO2 nanocomposite material prepared by co-precipitation method and sonication technique and nanocomposite material characterized by HR-SEM and HR-TEM result demonstrate that the initial spherical shape like an irregular particle for the nanocomposite material. The EDX analysis confirms that Cr, Ce and O are present from nano photocatalyst. The X-ray XRD study catalyst are fine crystallized among that little surface areas and to gives high crystalline size by HR-TEM images, The PL measured low intensity and UV-Vis DRS calculated low band gap energy also result as conformed high photocatalytic activity on by Trypan Blue (TB) dye at CrO4-CeO2 nanocomposite material. The prepared CrO4-CeO2 nanocomposite material high efficiency of photocatalyst that of CeO2 under UV and solar-Light irradiation and mechanism has been discussed and high current produced from DSSCS application of, electrochemical industrial was done; prepared nanocomposite material was stability and reusability of photocatalyst.