High-performance planar supercapacitors have attracted increasing attention because of their thin, light and flexible abilities. Here we developed novel flexible symmetrical planar supercapacitors (FSPSCs) by using the multi-layered MnO₂/Ni/graphite/paper electrodes that were fabricated by sequentially coating a graphite layer, Ni layer, and MnO₂ layer on ordinary cellulose paper. The MnO₂/Ni/graphite/paper electrodes show a large specific capacitance (C_sp) of 175 mF cm⁻² at a scan rate of 5 mV s⁻¹. The assembled FSPSCs based on the multi-layered MnO₂/Ni/graphite/paper electrodes exhibit a large volumetric C_sp (1020 mF cm⁻³ at 5 mV s⁻¹) and a superior long-term cycle stability (less 4% loss of the maximum C_sp after 6000 cycles). The FSPSCs based on the multi-layered MnO₂/Ni/graphite/paper electrodes may open up new opportunities in developing novel supercapacitor devices because of the low-cost, high performance, and facile large-scale fabrication procedures.