An automatic material surface slicking device of a sintering machine comprises a machine frame and a material slicking plate. A fixing base is arranged on the material slicking plate, a fixing plate is arranged below the machine frame, the fixing plate is hinged to one end of a connecting plate, and the other end of the connecting plate is hinged to the fixing base. Due to the fact that the connecting plate is respectively and movably connected with the machine frame and the material slicking plate, when the sintering performance of sintering materials changes and the thickness of the material layers is increased or reduced, manual interference is not needed, the connecting plate rotates along a rotating shaft, the material slicking plate rotates along the rotating shaft and presses the material surface all the time along with the change of the thickness of the material layers, the material surface is automatically slicked in time, the igniting quality is ensured, and the product quality loss is reduced.