In recent years, the green synthesis metal oxide nanoparticles using various plant extracts has attracted great attention. This is because; these methods are simple, inexpensive and, eco-friendly. In this research work mainly have focused on the green synthesis of silver nanoparticles (AgNPs) and zinc oxide nanoparticles (ZnONPs) and Ag coated with ZnO nanocomposite (Ag/ZnO) by using leaf extract of Ipomoea Indica (II) as reducing and stabilizing agent. Silver nitrate (AgNO3) and Zinc acetate dihydrate (Zn(CH3COO)2.2H2O), are the forerunners in the hydrothermal Synthesis. The prepared AgNPs, ZnONPs, and Ag/ZnO nanocomposite were characterized using various instrumental techniques such as Fourier Transform-Infrared spectroscopy (FT-IR), UV-visible spectroscopy (UV-Vis), X-ray diffraction pattern (XRD) and Scanning electron microscope (SEM), Energy dispersive X-ray analysis (EDAX), High Resolution-Transmission Electron microscope (HR-TEM). The results obtained that of Ag/ZnO nanocomposite were the average size 20-50 nm. The Tauc plot of Ag/ZnO nanocomposite shows lower band gap (1.73ev). Under visible light illumination, methylene blue (MB) was degraded photocatalytic studies using AgNPs, ZnONPs, and Ag/ZnO nanocomposite, which was then examined using UV- visible spectroscopy. In comparison to AgNPs (86%) and ZnONPs (81%), Ag/ZnO nanocomposite shown superior photocatalytic activity for the breakdown of MB with a high percentage degradation efficiency (90%). The photocatalytic degradation rate constant was evaluated by using a pseudo-first order kinetic equation. Additionally, the agar disc diffusion method was used to examine the antibacterial activity against two bacterial strains (Escherichia coli and Staphylococcus aureus), and a sizable zone of inhibition against the bacterial strains was found.