The utility model relates to a novel automatic foldable desk chair which comprises a chair main body, a rotary folding device, a telescopic desk top and a support, wherein the rotary folding device is arranged on the left side of the chair main body; the telescopic desk top is positioned at the upper part of the rotary folding device; the support is arranged on the right side of the chair main body; the rotary folding device comprises a support handgrip, an outer shaft sleeve, an inner shaft sleeve, an end cover, a speed-reducing motor, a coupler, a support platform, two first sliding rails, two first sliding blocks, a rotary motor, a universal joint, a screw rod, two lug bases, a nut and a bottom plate. The novel automatic foldable desk chair has the advantages that the desk top can move with two freedom degree directions (rotation and translation) in space, so that the desk top overturning and folding effects are achieved; by virtue of the support, the bending deformation of the desk top is reduced, and the stability and bearing capacity of the desk top are improved.