The invention provides an antifreeze sprinkling device in a coal train carriage, comprising a column bracket, a motor, a decelerator a bearing seat assembly, a hollow mainshaft, a water closure, a sprinkling arm pipe, etc. The left column bracket and the right column bracket are pivotally connected by a pin shaft; the sprinkling arm pipe consists of an upper arm pipe and a lower arm pipe which are pivotally connected together; the lower arm pipe is provided with a nozzle; when the hollow mainshaft rotates, the sprinkling arm pipe can extend into the carriage to sprinkle the antifreeze uniformly on the internal surface; the sprinkling device can also uniformly sprinkle the antifreeze to the coals, effectively avoids bottom-sticking, wall-sticking and the agglomeration of coal in the train carriage when the train for coal transportation is under cold transportation environment and ensures the successful unloading. The device is suitable for the anti-freeze transportation of coal trains.