▎ 摘　　要

NOVELTY - A preparation device of graphene oxide, comprising a storage system, a reaction system, and a post-processing system. the storage system comprises a graphite storage tank, a concentrated acid storage tank, a first oxidant storage tank, a second oxidant storage tank, and a de-ionized water storage tank. the reaction system comprises a low temperature pre-mixing kettle; a low temperature reaction kettle; a first middle temperature reaction kettle connected with the low temperature pre-mixing kettle; a second middle temperature reaction kettle connected with the first middle temperature reaction kettle and the low temperature reaction kettle; and a high temperature reaction kettle connected with the second middle temperature reaction kettle; the graphite storage tank and the concentrated acid storage tank; and the first oxidant storage tank is connected with the low temperature pre-mixing kettle; the concentrated acid storage tank and the second oxidant storage tank are connected with the low temperature reaction kettle; the de-ionized water storage tank is connected with the high temperature reaction kettle. the post-processing system comprises a stripper connected with the high temperature reaction kettle. The preparation device of graphene oxide of the utility model can oxidize the graphite with larger size to obtain the graphene oxide with larger size.