The invention discloses an amidated graphene oxide modified polycarboxylate superplasticizer. The main raw materials include: graphene oxide, methylallyl polyoxyethylene ether, acrylic acid, allyl amine, maleic anhydride, water, an oxidizing agent, a reducing agent, a condensation agent and an activating agent. The main method includes: firstly subjecting allyl amine and graphene oxide to amidation reaction to prepare allyl amine modified graphene oxide, then mixing the obtained allyl amine modified graphene oxide with methylallyl polyoxyethylene ether, acrylic acid and maleic anhydride, carrying out polymerization reaction under the initiation of the oxidizing agent and reducing agent, thus obtaining the amidated graphene oxide modified polycarboxylate superplasticizer. The method provided by the invention mainly utilizes the amidation reaction of allyl amine and graphene oxide to realize close combination of a graphene oxide two-dimensional nano lamellar structure with polycarboxylate superplasticizer molecules, so that graphene oxide can be better dispersed during application in concrete, and the synthesized superplasticizer product has more stable performance.