Lithium-sulfur batteries are regarded as promising candidates for energy storage devices due to their high theoretical energy density. The practical application is hindered, however, by low active material utilization and unsatisfactory capacity retention caused by the diffusion of polysulfides. Herein, we present a novel strategy for the configuration of the sulfur cathode, which is composed of an integrated carbon/sulfur/carbon sandwich structure on polypropylene separator (CSC@separator) that is produced via the simple doctor blade technique. The integrated electrode exhibits excellent flexibility and high mechanical strength. The upper and bottom carbon layers of the sandwich-structured electrode not only work as double current collectors which effectively improve the conductivity of the electrode, but also serve as good barriers, suppressing the diffusion of the polysulfide and buffering the volume expansion of the active materials during cycling. The CSC@separator cathode delivers high reversible capacity of 730 mAh g^-1 after 500 cycles with a small capacity decay of 0.058% per cycle, and also demonstrates low self-discharge behaviour.