A plasma apparatus for simultaneously treating internal and external surfaces of a tubular fabric and a using method thereof are provided. The plasma apparatus includes a plasma generating apparatus, a lifting apparatus, a cooling system and a winding apparatus, wherein the lifting apparatus, the cooling system and the winding apparatus are separately connected to the plasma generating apparatus. The tubular fabric passes through a gap between an internal electrode and an external electrode. When an end socket cover of the inner electrode is opposite to a limiting circular tube of the external electrode, the gap between the electrodes is small and stable in size. After the electrodes are electrified, plasma is generated in the gap between the two electrodes, the internal and external surfaces are simultaneously subjected to plasma treatment when the tubular fabric passes through the gap, fiber surfaces of the tubular fabric are etched, an oiling agent on fiber surfaces is removed, and active groups are generated on the surfaces of the fabric, and therefore adhesive strength between the fabric and a rubber tube or a coating is significantly improved in a subsequent compounding process.