Abstract: The preparation of porous carbon materials by high-temperature pyrolysis/activation of biomass under the protection of inert gas has the advantages of low cost, simple process, etc., and is an effective way to use waste and reduce environmental pollution. In this study, three different biomass materials were prepared by high-tempe-rature pyrolysis/activation to prepare porous carbon materials, which were combined with commercially conduc-tive carbon paste to make composite carbon paste and applied to the counter electrodes of perovskite solar cells (PSCs). The morphology, structure and specific surface area of different biomass porous carbon materials affect the photoelectric performance of the device. The results show that the photoelectric performance of PSCs based on different biomass porous carbon materials depends on the morphology, crystallinity, specific surface area and morphology of the biomass porous carbon materials and the interface contact between the perovskite/carbon electrode. The carbon-based PSCs prepared by the composite carbon electrode based on biomass porous carbon combined with the grinding process can obtain the highest photoelectric conversion efficiency (PCE) of 10.18% due to its good interface performance (the PCE of the PSCs without composite biomass carbon is 6.39%). After the best device is stored in air conditions for 60 days, 96% of the initial PCE was still retained.