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A facile and controllable dual‐carbon microreactor approach has been developed to prepare graphene and amorphous carbon co‐decorated LiFePO4(LFP) nanocomposites (G/LFP@C). Physical characterizations demonstrate that the particle size of the restricted LFP crystals is ≈30–50 nm, which are well proportioned and well anchored on the surface of graphene and completely coated by the amorphous carbon layers. The electrochemical data demonstrate the impressive electrochemical performances of the G/LFP@C composite and its application potential as a cathode material of lithium ion batteries (LIBs). Particularly, the large specific capacity (161.3 mAh g−1at 0.2 C), superior rate property (93.8 mAh g−1at 20 C), and outstanding cycling stability (97.3% capacity retention over 1000 cycles at 10 C) are simultaneously realized for G/LFP@C because of the optimized electrochemical reaction kinetics with effective dual‐carbon co‐constructed conductive network and abundant active sites. It is believe that this work not only supplies unique in sights into the reasonable design of LFP materials for favorable property LIBs, but also holds great potential for the energy storage market. A dual‐carbon microreactor approach has been developed to prepare graphene and amorphous carbon co‐modified LiFePO4(LFP) nanocomposites with restricted LFP crystals of ≈30–50 nm, which are well anchored on the surface of graphene and completely coated by the amorphous carbon layers. The test results confirm its electrochemical performance and application potential for lithium ion batteries.