A hinge mechanism, comprising a hinge base and two rotating support mechanisms respectively connected to two opposite sides of the hinge base; wherein the two rotating support mechanisms can rotate relative to each other, so that the hinge mechanism is switchable between a first folded state and a second folded state, and each of the rotating support mechanism comprises a rotating shaft, a hinge rotating plate, and a hinge moving plate, wherein: the rotating shaft is rotatably arranged on the hinge base, the hinge rotating plate is rotatably connected to the hinge base through the rotating shaft, a first end of the hinge rotating plate adjacent to the rotating shaft is provided with an accommodating groove, and a second end of the hinge rotating plate away from the rotating shaft is a first support portion; the rotating shaft is provided with a speed reducer, the speed reducer has a rotating output portion, the rotating output portion can rotate along with the rotating shaft, a rotating speed of the rotating output portion is lower than that of the rotating shaft, and the rotating output portion and the hinge moving plate are rotatably connected to each other; the hinge moving plate comprises a second support portion, and the second support portion is at least partially located in the accommodating groove; when the hinge mechanism is in the first folded state, openings of the accommodating grooves of the two rotating support mechanisms face each other, and the second support portion moves to an avoidance position away from directions of the openings of the accommodating grooves; and when the hinge mechanism is in the second folded state, openings of the accommodating grooves of the two rotating support mechanisms are opposite to each other, and the second support portion moves to a support position towards directions of the openings of the accommodating grooves; wherein the rotating output portion is rotatably connected to the hinge moving plate through a pulling rod a first end of the pulling rod is rotatably connected to the rotating output portion, and a second end of the pulling rod is rotatably connected to the hinge moving plate. the rotating shaft is rotatably arranged on the hinge base, the hinge rotating plate is rotatably connected to the hinge base through the rotating shaft, a first end of the hinge rotating plate adjacent to the rotating shaft is provided with an accommodating groove, and a second end of the hinge rotating plate away from the rotating shaft is a first support portion; the rotating shaft is provided with a speed reducer, the speed reducer has a rotating output portion, the rotating output portion can rotate along with the rotating shaft, a rotating speed of the rotating output portion is lower than that of the rotating shaft, and the rotating output portion and the hinge moving plate are rotatably connected to each other; the hinge moving plate comprises a second support portion, and the second support portion is at least partially located in the accommodating groove; when the hinge mechanism is in the first folded state, openings of the accommodating grooves of the two rotating support mechanisms face each other, and the second support portion moves to an avoidance position away from directions of the openings of the accommodating grooves; and when the hinge mechanism is in the second folded state, openings of the accommodating grooves of the two rotating support mechanisms are opposite to each other, and the second support portion moves to a support position towards directions of the openings of the accommodating grooves; wherein the rotating output portion is rotatably connected to the hinge moving plate through a pulling rod a first end of the pulling rod is rotatably connected to the rotating output portion, and a second end of the pulling rod is rotatably connected to the hinge moving plate.