<p>The current global environmental situation calls for innovative, environmentally friendly solutions to global demand problems. This category includes green polymer-based composites and natural energy from renewable sources, such green composites (GC), natural fiber-reinforced biocomposites. To improve the composite’s overall strength, the current study attempts to optimize a number of contributing factors, including fiber type (FT), weight % of fibers (WP), chemical treatment (TT), and inclusion of Nano fillers (NFT). In this work Composite panels were made using Cashew nut shell oil (CNSL) as a matrix material and different weight percentages of Bamboo fiber (BB), Areca Leaf sheet (ALS), and Coconut leaf petiole fibers/coconut mid rib (CMR) as reinforcement using compression moulding process. The Design of Experiment concept has been adopted in order to design 27 experiments using L27 orthogonal array. The scope of study is also to investigate the effect of chemical treatments and the Nano fillers on the mechanical strength of the composite. Silane (S) and Alkali treatment (NaOH) were performed on the fibers and three types of Nano fillers were used i.e. Carbon Nano tubes (CNT), Graphene (G) and Silicon Oxide (SD). The physical properties of the composites, such as their tensile strength, flexural strength and water-absorption capabilities, were examined. Analyses were conducted on the responses using the Taguchi experimental design. The most ideal mechanical characteristics were found in the composites that included 10% bamboo fiber, silane treatment, and carbon nanotube. When it comes to increasing the strength of the composite, bamboo fiber comes in first, then 10% of the weight, silane treatment, and carbon nanotubes. The composite panels made up from above combination gives better results as compared to the other natural fiber composite materials.</p>