The invention discloses a top surface grinding tool, which comprises a piece of abrasive paper (1), a grinding head (2), a fixed base layer, a fixing bolt (5), a ground supporting rod (7), an operating supporting rod (8) and a rotating shaft bolt (9), wherein the abrasive paper (1) covers the grinding head (2), the grinding head (2) is arranged on the fixed base layer, the fixed base layer is installed at the upper end of the fixing bolt (5), the lower end of the fixing bolt (5) is rotatably installed on the operating supporting rod (8), the ground supporting rod (7) is rotatably installed on the operating supporting rod (8) through the rotating shaft bolt (9) and the ground supporting rod (7) is supported on the ground. The top surface grinding tool provided by the invention has the advantages that the labor and the time consumed for grinding top surfaces can be reduced, the health of construction personnel is prevented from being jeopardized, the construction cost is reduced, the construction efficiency is improved and the overall construction progress is accelerated.