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 (L) 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 (L) of the bottom seat ; the two driving assemblies are respectively located at the two sides of the central axis (L) 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 (A) 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 (L) 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 (L) 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 (L) of the bottom seat ; the two driving assemblies are respectively located at the two sides of the central axis (L) 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 (A) 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 (L) of the bottom seat . <EOS>