A foldable mechanism, comprising a base assembly, two support assemblies, and two driving assemblies, wherein the base assembly comprises a bottom seat and two hinge seats, and the two hinge seats are respectively fixed to two sides of the bottom seat; the two support assemblies are respectively located at two sides of a central axis of the bottom seat, each support assembly comprises an outer plate member and an inner plate member, the two inner plate members are located between the two outer plate members, each outer plate member and the corresponding inner plate member are pivotally connected to the corresponding hinge seat, and pivotal axes of the outer plate members and the inner plate members are parallel to the central axis of the bottom seat; the two driving assemblies are respectively located at the two sides of the central axis of the bottom seat, and each driving assembly is connected to and between the bottom seat and the inner plate member corresponding to the driving assembly; and in a case that the foldable mechanism is in a folded state, the driving assemblies respectively drive the corresponding inner plate members to flip toward the bottom seat, to form a concave space for accommodating a bending part of a flexible screen at an angle between the two inner plate members; wherein the base assembly further comprises two stop ribs; and the stop ribs correspond to the inner plate members one to one, the stop rib is located between the bottom seat and the corresponding inner plate member, a first end of the stop rib is connected to the bottom seat, and a second end of the stop rib is configured to come into contact with the part of the inner plate member close to the central axis of the bottom seat. the base assembly comprises a bottom seat and two hinge seats, and the two hinge seats are respectively fixed to two sides of the bottom seat; the two support assemblies are respectively located at two sides of a central axis of the bottom seat, each support assembly comprises an outer plate member and an inner plate member, the two inner plate members are located between the two outer plate members, each outer plate member and the corresponding inner plate member are pivotally connected to the corresponding hinge seat, and pivotal axes of the outer plate members and the inner plate members are parallel to the central axis of the bottom seat; the two driving assemblies are respectively located at the two sides of the central axis of the bottom seat, and each driving assembly is connected to and between the bottom seat and the inner plate member corresponding to the driving assembly; and in a case that the foldable mechanism is in a folded state, the driving assemblies respectively drive the corresponding inner plate members to flip toward the bottom seat, to form a concave space for accommodating a bending part of a flexible screen at an angle between the two inner plate members; wherein the base assembly further comprises two stop ribs; and the stop ribs correspond to the inner plate members one to one, the stop rib is located between the bottom seat and the corresponding inner plate member, a first end of the stop rib is connected to the bottom seat, and a second end of the stop rib is configured to come into contact with the part of the inner plate member close to the central axis of the bottom seat.