The invention discloses an adjustable wiping device which comprises a telescopic rod, a wiping mechanism and a cleaning liquid box. The wiping mechanism comprises a U-shaped frame, two spline shafts, a rotating stand, a fixed disc and a fixing assembly, wherein the U-shaped frame is detachably arranged at the end of the telescopic rod; the two spline shafts are fixedly arranged on the two sides of the U-shaped frame respectively; the two ends of the lower portion of the rotating stand are hinged to the inner side of one spline shaft respectively through fixed matching discs so that the rotating stand can rotate around the spline shaft, the peripheries of the fixed matching discs are provided with a plurality of grooves, and the end of the rotating stand is provided with wiping sponge. The periphery of the fixed disc is provided with a plurality of bosses each corresponding to one groove, and the fixed disc is in sleeved connection with the positions of key grooves of the spline shafts and is matched with the grooves through the bosses to fix the fixed matching discs. The fixing assembly is used for fixing the fixed disc on the spline shafts. The cleaning liquid box is detachably connected to the wiping sponge through a liquid conveying pipe. According to the device, the shortcoming that it is difficult to perform clearing work on high windows can be overcome.