Biochar is a low-cost carbon material derived from the thermal or chemical treatment of biomass. Due to its chemical structure, biochar has a high surface area and functional groups can be attached to its surface using some activation methods. This property makes it versatile to use as catalyst /catalyst support for various chemical reactions. The carbonaceous material derived from biomass is environment friendly and cost-effective as compared to existing heterogeneous catalyst. The hydrophobicity, tunable surface properties, thermal stability, and chemically inert nature make biochar suitable for catalyst support at extreme operating conditions.This paper focuses on the different methods for the preparation of biochar for heterogeneous chemical reactions. In this paper, the production of pyrochar and hydrochar is discussed, and its activation and/or functionalization methods are also included. Subsequently, the application of biochar-based catalysts in the various heterogeneous catalytic reaction are discussed.