Indoor multi-core mini optical cable (GJFJVY) using multi-core subunits( Φ 250 µ m colored optical fiber, aramid reinforced element), non-metallic center reinforced core, optical cable subunit layer twisted at the center reinforced core to form the cable core, with a layer of polyvinyl chloride (PVC) or low smoke halogen-free material (LSZH, low smoke, halogen-free, flame retardant) sheath extruded from the outermost.