The invention provides a method for improving the local comprehensive mechanical performance of a high-manganese steel frog. The method mainly comprises the steps of heightening a point rail and ringrails by 30-40 mm within the width range 20-50 mm of the point rail in the process of casting the high-manganese steel frog, wherein the horizontal length of the heightened parts is 560 mm; heating the high-manganese steel frog to 1100-1200 DEG C and conducting constant-pressure heat preservation for 3-6 h to completely austenitize the high-manganese steel frog; putting the high-manganese steel frog onto a die to conduct forging and pressing on the heighted areas through a forging hammer at the reduction height of 15-22 mm, only forging and pressing part of the heightened height, and conducting mechanical cutoff on the remaining heightened parts at the cutoff height of 15-18 mm to ensure that the overall working surfaces of the high-manganese steel frog are located in the same horizontal plane; and heating the high-manganese steel frog to 1150+/-10 DEG C, conducting heat preservation for 20-40 min and then immediately conducting water toughening treatment to obtain a good single-phaseaustenite structure. Through the method, the defect of inclusions in the point rail and the wing rails can be reduced even eliminated to a great extent, the wear resistance is improved, the service life is prolonged, operation is easy, the cost is relatively low, and the method can be widely popularized.