An adjustable dustproof sunshade arrangement includes a wall base, a supporting arm and an adjustable joint including a supporting seat mounted at the wall base and an adjustment member pivotally connected with an inner end of the supporting arm in a longitudinal direction, wherein the adjustment member is pivotally connected to the supporting seat in a transverse direction such that the supporting arm is adapted to longitudinally and transversely shift with respect to the wall base. A fabric shelter has an inner edge attached to the wall base and an outer edge extended to attach to an outer end of the supporting arm to define a shading area under the fabric shelter, wherein the supporting arm is adapted to longitudinally and transversely shift with respect to the wall base to selectively adjust a position of the fabric shelter so as to maximize the shading area thereunder.