▎ 摘　　要

NOVELTY - Preparing porous graphene magnetic carbon block comprises (i) uniformly dispersing graphene oxide in solvent, then adding mixed solution of surfactant and mixing uniformly to obtain graphite oxide and surfactant, (ii) adding cobalt salt and polymer into the mixed solution obtained in step (i), and then stirring uniformly to obtain precursor solution, and (iii) carrying out hydrothermal reaction of precursor solution obtained in step (ii), washing the product, drying, and heating to obtain final product. USE - The carbon block is useful in the sewage treatment field (claimed). ADVANTAGE - The carbon block has light weight, simple preparation method, low cost and high yield, adsorbs organic matter, organic dye and heavy metal ion, and is easy to realize commercialization.