1. A supporting device, comprising:a supporting frame for supporting a display screen, the supporting frame defining a supporting chamber therein;
at least one storing chamber for storing a flowing medium, the storing chamber being communicated with the supporting chamber through a channel;
an assisting member, configured to make the flowing medium flow between the supporting chamber and the storing chamber by a movement of the assisting member;
wherein the assisting member comprises a sliding baffle, and the sliding baffle moves to make the flowing medium flow into the supporting chamber or flow into the storing chamber;
wherein the sliding baffle is disposed in the storing chamber to divide the storing chamber into a carrying cavity for accommodating the flowing medium and a non-carrying cavity,
when the sliding baffle moves in a direction of reducing a volume of the carrying cavity and increasing a volume of the non-carrying cavity, the flowing medium enters the supporting chamber from the carrying cavity, and
when the sliding baffle moves in a direction of increasing the volume of the carrying cavity and reducing the volume of the non-carrying cavity, the flowing medium returns from the supporting chamber to the storing chamber.