The invention discloses a locomotive rail coat nozzle fixing device which includes a left and right support combination, transverse support combindation, a nozzle box, the left and right support assemblies comprising a left support seat, Right support seat, An upper part of that left support seat is connected with an inner side of a left side of a locomotive wheel bear body through a bolt-nut combination, An upper part of that right support seat is connected with an inner side of a right side of a locomotive wheel bear body through a bolt-nut combination, a lower part of the left support seatand a lower part of the right support seat are respectively connected with one end of a transverse support combination, and the other end of the transverse support combination is connected with a spray head box. The upper part of the right support seat is connected with an inner side of the right side of the locomotive wheel bearing body through a bolt-nut combination. The invention can conveniently adjust the horizontal position and the vertical position of the spray head, greatly reduces the workload of the coating operator, the positioning adjustment of the spray head is convenient and reliable, ensures that the nozzle position and the rail coating position are at the best matching position, so that the position of the lubricating oil coated on the rail is more accurate, and the consumption of the lubricating oil is less.