PURPOSE: To provide a trolley line polishing jig capable of simply efficiently polishing the trolley line.

CONSTITUTION: There are provide a wheel 12 journalled rotatably in the nearly central part of a lever 11 to roll on a trolley line 4 and a grinding wheel 14 provided adjacent to the lower surface of the trolley line 4 in the front end 11a of the lever 11 to abut against the lower surface of the trolley line 4 and slide on the lower surface as the lever 11 moves when the proximal end side of the lever is pushed.