The invention discloses a guitar slide bar with an elastic structure. The inner circumference of the tubular slide bar is provided with an upper semicircular elastic steel plate and a lower semicircular elastic steel plate in a same axis, wherein the upper semicircular elastic steel plate and the lower semicircular elastic steel plate are symmetrical with each other. The wall thickness parts of the upper semicircular elastic steel plate and the lower semicircular elastic steel plate are respectively provided with a plurality of uniformly distributed small holes. Gaps are arranged between the upper semicircular elastic steel plate and the lower semicircular elastic steel plate. A first supporting strip is arranged outside the left radial end of the upper semicircular elastic steel plate. The first supporting strip is fixedly embedded into the left wall thickness of the tubular slide bar along the radial direction. A second supporting strip is arranged the right radial end of the lower semicircular elastic steel plate. The second supporting strip is fixedly embedded into the right wall thickness of the tubular slide bar along the radial direction. The guitar slide bar has advantages of flexibly adjusting finger tightness, eliminating a closed compression environment, promoting blood circulation, preventing partial itchy skin and furthermore preventing normal guitar playing stoppage caused by falling of the guitar slide bar from a finger.