The invention relates to a method for maintaining a blast furnace taphole. The technical scheme is that the method comprises the following steps of: cleaning iron runners on two sides of the taphole, a mud sleeve and a taphole frame 1, welding a blind plate 3 to the taphole frame, grouting a grouting nozzle stub on the blind plate 3 by adopting a thermoplastic phenolic resin bonded hard press-in material, standing for 1 to 1.2 hours, detaching the blind plate 3, and cleaning up the grouting material in the taphole; welding a baffle plate 5 to the taphole frame, and pouring an iron runner castable; and respectively opening a grouting hole on a left cross joint, a right cross joint and a vertical joint on the taphole cooling wall, and grouting each grouting hole until the pressure is 4.5 to5MPa. The method has the characteristics of good treatment effect, reduction of gas leakage in a blast furnace taphole area and guarantee of normal production of the blast furnace.