A linear motion mechanism, a drawer assembly, and a storage cabinet, relating to the technical field of linear motion. The linear motion mechanism comprises a rotating wheel around which a flexible cable is wound, the flexible cable being suitable for moving along with rotation of the rotating wheel, and the flexible cable comprising flexible cable sections located on the two sides of the rotating wheel; a rotation driving member which is connected to the rotating wheel and suitable for driving the rotating wheel to rotate; a mounting member, the mounting member being provided with a guide rail, a first fixed pulley being mounted on the mounting member; and a first-stage sliding rail which is suitable for sliding relative to the guide rail.