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The rational design of the flexible anode with high reversible capacity and cycle stability for lithium-ion batteries (LIBs) has broad development prospects. A simple self-assembly method at room temperature for preparing N-doped Co0.85Se nanosheets anchored on carbon fibers as anode material for flexible Li-ion batteries is introduced in this work. The cost-effective compressed mask with abundant hydroxyl groups that can better anchor the MOFs (ZIF-67) is used as carbon source. The carbon fibers in composite Co0.85Se@Carbon Mask Fibers (Co0.85Se@CMF) provide a 3D conductive network to build continuous transmission channel for electron and ion, and also reduce the volume change-effect during charging&discharging process, which make the composite show a superior performance in LIBs. After 800 cycles, the average capacity attenuation of the composite is 0.065% per cycle, which shows the extremely possible application prospects of the composite in terms of capacity and cycle stability.