The invention relates to a water surface leveler comprising a cutter body and a blade installed on the cutter body. The cutter body consists of a handle part and a cutter head part; and an included angle is formed between the handle part and the cutter head part. The blade includes an upper inclined main blade, a lower inclined main blade, and a lower inclined angular blade, wherein the upper inclined main blade and the lower inclined main blade are installed at the side of the cutter head part and the lower inclined angular blade is installed at the connection corner of the cutter head part and the handle part; mounting slots for installing the blade parts are formed in the side of the cutter head part and the corner; and the blade parts are fastened in the mounting slots by bolts. Besides, an auxiliary handle is hinged to one side, far away from the blade, of the cutter head part; and a spring is installed between the auxiliary handle and the cutter head part. According to the invention, with multiple blade parts facing different directions, a common coating layer can be shaved upwardly and downwardly and a hard layer can be knocked with large forces, so that the shaving efficiency and the leveling effect can be improved substantially; and because of the auxiliary handle, dual-hand operation can be realized, the operation force can be controlled easily, and the labor intensity is reduced.