Solid dry wastes are used as fermentation substrates in numerous industries these days, including textile, culinary, and medicinal. Solid surface matrix is employed in solid-state fermentation (SSF), a fermentation process that occurs without or almost entirely with the availability of free water. This involves growing microorganisms without an aqueous phase that is free to flow. SSF has now taken the place of submerged fermentation (SmF), which was a conventional method for producing α-amylase. SSF is used as an alternative to SmF in many industrial processes, including the synthesis of enzymes, biofuels, organic acids, single-cell proteins, antibiotics, fragrances, and biopesticides. In the past, fungi were the only microorganisms of option for SSF fermentation operations; however, these days, a range of bacterial strains are also employed in them. Because of its simplicity, comparatively low initial and ongoing costs, reduced water production, and other advantages, SSF improves the natural habitat of microorganisms and is a better option overall. SSF containing agro-industrial leftovers has also taken the place of expensive media used in submerged fermentation to produce α-amylase. An other source for using these substrates as a solid substrate for the synthesis of amylase and other beneficial industrial products is the filamentous fungus that consumes agro-industrial residues. In this research, we attempted to examine the potential and optimization techniques of several solid substrates employed in the synthesis of fungal amylase.