The invention relates to a rotating arm type antifreezing fluid spraying device for two-lane coal trains, belongs to the technical field of mechanical design and control, and in particular relates to an antifreezing fluid spraying device capable of evenly spraying antifreezing fluid from a position close to a nozzle to five surfaces in carriages of the coal trains in short distance. The antifreezing fluid spraying device is characterized by consisting of a square upright post 1, a side attached fastening device, a drive reducing mechanism, a swing mechanism, an upper connecting plate 12, a lower connecting plate 13, a multi-azimuth nozzle steering mechanism and a control system; and the antifreezing fluid spraying device makes operators far away from the spraying field by utilizing remote control, reduces the labor intensity of the operators, improves the labor environment, saves the dosage of the antifreezing fluid, saves the cost, ensures the safety of human bodies and transportation, can automatically recognize the carriages and headstocks, begins spraying when the carriages enter a spraying area, stops spraying when the carriages leave the spraying area, does not spray the fluid when couple empty spaces between the carriages and the headstocks of locomotives pass, and really realizes the full automatic antifreezing fluid spraying of railroad coal trains.