The invention discloses duoparental oxidized graphite and a preparation method thereof. The duoparental oxidized graphite is prepared by the following steps: oxidized graphite is added to a dispersant under the protection of nitrogen gas or inert gas and is dispersed to form a mixed solution; a bridging agent is added to the mixed solution and is stirred at the room temperature under the protection of the nitrogen gas or the inert gas to obtain a mixed solution; the mixed solution is poured into a precipitator and is subjected to flocculation, precipitation, centrifugation, washing and vacuumdrying; and the oxidized graphite modified by the bridging agent and duoparental macromolecules are added to the dispersant, are stirred and dispersed under the protection of the nitrogen gas or the inert gas to obtain a mixed solution; and the mixed solution is poured into the precipitator and is subjected to flocculation, precipitation, centrifugation, washing and vacuum drying to obtain the duoparental oxidized graphite. Through the bridging function, a modifier containing multifunctional groups is introduced; and the duoparental oxidized graphite prepared by the method can be dispersed inboth an organic phase and an aqueous solution, thereby greatly broadening the filling range of the oxidized graphite.