Abstract: The present application relates to the technical field of carbon material preparation, and provides a porous carbon and a preparation method thereof. The preparation method includes: subjecting a plant tissue to a first drying treatment, a crushing treatment, and a dehydration treatment sequentially to obtain an oxygen-rich matrix, with a temperature of the dehydration treatment being 120-320° C.; mixing heavy oil, an activator, and a solvent to obtain a mixed solution; impregnating the oxygen-rich matrix in the mixed solution, with an impregnating duration being ?10 min; then removing the solvent to obtain a composite; calcining the composite to obtain the porous carbon. The disclosure can obtain porous carbon that balances high specific surface area, mesoporous specific surface area, total pore volume, compaction density, and particle strength.