A rollable display device, comprising: a flexible display screen, a lifting mechanism connected to a top end of the flexible display screen, and a rollable screen mechanism connected to a bottom end of the flexible display screen, wherein the lifting mechanism is configured to drive the flexible display screen to move up or down; and the rollable screen mechanism is configured to unfold the flexible display screen when the lifting mechanism drives the flexible display screen to move up or roll up the flexible display screen when the lifting mechanism drives the flexible display screen to move down, wherein the lifting mechanism comprises: a cross beam, a supporting frame, and a connecting rod assembly and a push rod assembly which are arranged on the supporting frame; the cross beam is connected to the top end of the flexible display screen; the connecting rod assembly is connected to the cross beam and is configured to drive the cross beam to move up or down, wherein the connecting rod assembly comprises a first connecting rod, a second connecting rod, a first connecting piece, a second connecting piece, a third connecting rod and a fourth connecting rod; one end of the first connecting rod and one end of the second connecting rod are connected to two ends of the cross beam respectively, the other end of the first connecting rod is connected to one end of the third connecting rod through the first connecting piece, and the other end of the second connecting rod is connected to one end of the fourth connecting rod through the second connecting piece; and characterized in that the supporting frame is provided with a first sliding groove and a second sliding groove; the other end of the third connecting rod and the other end of the fourth connecting rod are connected to the push rod assembly respectively through the first sliding groove and the second sliding groove, the push rod assembly is configured to transmit power to the connecting rod assembly. a flexible display screen, a lifting mechanism connected to a top end of the flexible display screen, and a rollable screen mechanism connected to a bottom end of the flexible display screen, wherein the lifting mechanism is configured to drive the flexible display screen to move up or down; and the rollable screen mechanism is configured to unfold the flexible display screen when the lifting mechanism drives the flexible display screen to move up or roll up the flexible display screen when the lifting mechanism drives the flexible display screen to move down, wherein the lifting mechanism comprises: a cross beam, a supporting frame, and a connecting rod assembly and a push rod assembly which are arranged on the supporting frame; the cross beam is connected to the top end of the flexible display screen; the connecting rod assembly is connected to the cross beam and is configured to drive the cross beam to move up or down, wherein the connecting rod assembly comprises a first connecting rod, a second connecting rod, a first connecting piece, a second connecting piece, a third connecting rod and a fourth connecting rod; one end of the first connecting rod and one end of the second connecting rod are connected to two ends of the cross beam respectively, the other end of the first connecting rod is connected to one end of the third connecting rod through the first connecting piece, and the other end of the second connecting rod is connected to one end of the fourth connecting rod through the second connecting piece; and characterized in that the supporting frame is provided with a first sliding groove and a second sliding groove; the other end of the third connecting rod and the other end of the fourth connecting rod are connected to the push rod assembly respectively through the first sliding groove and the second sliding groove, the push rod assembly is configured to transmit power to the connecting rod assembly.