The invention relates to the field of casting auxiliaries materials, in particular to a manufacturing method of an oxidized graphene modified 3D printing resin. The graphene modified 3D printing resin is prepared from, 7-13% of phenol, 1.5-2.5% of formic acid, 45-65% of furfuryl alcohol, 13-19% of formaldehyde, 7-13% of resorcinol, 3-7% of oxidized graphene, 0.5-1.5% of coupling agent and 0.5-1.5% of ethylene urea. Aimed at the problem in the prior art that a traditional resin for steel casting exits deficiences in 3D foundry sand printing, the oxidized graphene is creatively introduced, and thus the problem of sand burning in the steel casting is fundamentally solved; in addition, the oxidized graphene modified 3D printing resin can be used for conducting moulding on a sand mould with high heat resistance and high rigidity, can be used in a more complicated and thinner high-end casting, is stable in chemical properties, applicable to 3D printing technologies, high in strength of the foundry sand, simple and convenient to operate, and excellent in anti-sand burning performance.