Recently, rising petroleum product costs have coincided with an increase in the use of fossil fuels over time. It has caused environmental pollution problems around the world. The global community is consequently aggressively searching for alternate energy sources. Given the high yields, carbon emissions, and renewable sources. Biomass is a remarkable natural resource that has the ability to produce profitable bio-crude. Bio-crude can be generated through pyrolysis. Three byproducts of pyrolysis comprise bio-oil, pyro-gasses, and charcoal the amount of contaminants found in unprocessed biomass is significant, including water, tar, ash, and low calorific value. Upgradation methods or the biorefinery process can be used to eliminate all of these contaminants. Diesel fuel can be replaced by bio-oil in high-energy output after upgrading. This study examines the main elements of crude oil biorefineries, including downstream upgrading procedures, biomass feedstock processing, and thermochemical conversion techniques such as pyrolysis. Biocrude oil biorefineries offer an attractive option for sustainable bioenergy production. They are essential to the continuous shift towards a more resilient and environmentally friendly energy landscape as long as technology and process optimization continue to progress.