An electronic device comprising: a housing; a coil spring, disposed in the housing; a flexible screen; a rollable structure; characterized by the rollable structure comprising: an outer sliding rail, comprising a plurality of outer sliding blocks and a plurality of outer shafts, wherein the outer sliding blocks are disposed adjacently, each of the outer shafts is fixed between any adjacent two of the outer sliding blocks, and each of the outer sliding blocks comprises a groove (1111, 1121); and an inner sliding rail, comprising a plurality of inner sliding blocks and a plurality of inner shafts, wherein the inner sliding blocks are disposed adjacently, and each of the inner shafts is fixed between any adjacent two of the inner sliding blocks, wherein the inner sliding blocks are accommodated and slidably disposed in the grooves (1111, 1121) to make the inner sliding rail movably clamped in the outer sliding rail; wherein when axes of the outer shafts are aligned with axes of the inner shafts, the outer sliding blocks are capable of rotating and bending relative to each other by using the outer shafts as axes, and the inner sliding blocks are capable of rotating and bending relative to each other by using the inner shafts as axes, wherein after the inner sliding rail and the outer sliding rail move relative to each other, the axes of the inner shafts and the axes of the outer shafts are misaligned, and the inner sliding blocks are respectively located at positions of the axes of the outer shafts, so that the outer sliding rail and the inner sliding rail are in a plane, and wherein the outer sliding rail and the inner sliding rail are selectively accommodated in or are stretched out from the housing, and one of the outer sliding blocks of the outer sliding rail is connected to the coil spring; and wherein the flexible screen is disposed in close contact with one side of the outer sliding rail. a housing; a coil spring, disposed in the housing; a flexible screen; a rollable structure; characterized by the rollable structure comprising: an outer sliding rail, comprising a plurality of outer sliding blocks and a plurality of outer shafts, wherein the outer sliding blocks are disposed adjacently, each of the outer shafts is fixed between any adjacent two of the outer sliding blocks, and each of the outer sliding blocks comprises a groove (1111, 1121); and an inner sliding rail, comprising a plurality of inner sliding blocks and a plurality of inner shafts, wherein the inner sliding blocks are disposed adjacently, and each of the inner shafts is fixed between any adjacent two of the inner sliding blocks, wherein the inner sliding blocks are accommodated and slidably disposed in the grooves (1111, 1121) to make the inner sliding rail movably clamped in the outer sliding rail; wherein when axes of the outer shafts are aligned with axes of the inner shafts, the outer sliding blocks are capable of rotating and bending relative to each other by using the outer shafts as axes, and the inner sliding blocks are capable of rotating and bending relative to each other by using the inner shafts as axes, wherein after the inner sliding rail and the outer sliding rail move relative to each other, the axes of the inner shafts and the axes of the outer shafts are misaligned, and the inner sliding blocks are respectively located at positions of the axes of the outer shafts, so that the outer sliding rail and the inner sliding rail are in a plane, and wherein the outer sliding rail and the inner sliding rail are selectively accommodated in or are stretched out from the housing, and one of the outer sliding blocks of the outer sliding rail is connected to the coil spring; and wherein the flexible screen is disposed in close contact with one side of the outer sliding rail. an outer sliding rail, comprising a plurality of outer sliding blocks and a plurality of outer shafts, wherein the outer sliding blocks are disposed adjacently, each of the outer shafts is fixed between any adjacent two of the outer sliding blocks, and each of the outer sliding blocks comprises a groove (1111, 1121); and an inner sliding rail, comprising a plurality of inner sliding blocks and a plurality of inner shafts, wherein the inner sliding blocks are disposed adjacently, and each of the inner shafts is fixed between any adjacent two of the inner sliding blocks, wherein the inner sliding blocks are accommodated and slidably disposed in the grooves (1111, 1121) to make the inner sliding rail movably clamped in the outer sliding rail; wherein when axes of the outer shafts are aligned with axes of the inner shafts, the outer sliding blocks are capable of rotating and bending relative to each other by using the outer shafts as axes, and the inner sliding blocks are capable of rotating and bending relative to each other by using the inner shafts as axes, wherein after the inner sliding rail and the outer sliding rail move relative to each other, the axes of the inner shafts and the axes of the outer shafts are misaligned, and the inner sliding blocks are respectively located at positions of the axes of the outer shafts, so that the outer sliding rail and the inner sliding rail are in a plane, and wherein the outer sliding rail and the inner sliding rail are selectively accommodated in or are stretched out from the housing, and one of the outer sliding blocks of the outer sliding rail is connected to the coil spring; and wherein the flexible screen is disposed in close contact with one side of the outer sliding rail.