A compressed air profiling blowing device is used for blowing automobile bodies subjected to a rainfall test, and comprises a portal frame, a top profiling blowing mechanism, a side profiling blowing mechanism, a top guide mechanism, a side guide mechanism and a compressed air circuit. The top profiling blowing mechanism is mounted at the lower end of the top guide mechanism which is fixed onto a crossbeam of the portal frame, each of the side profiling blowing mechanism and the side guide mechanism comprises a left portion and a right portion in symmetry, the side profiling blowing mechanism and the side guide mechanism are fixed inside vertical columns on two sides of the portal frame, and the side profiling blowing mechanism and the side guide mechanism which are positioned on the same side are fixedly connected with each other. The compressed air circuit is arranged along the outside of the portal frame, and an air storage tank is connected to the tail end of the compressed air circuit. By means of the compressed air blowing and profiling technique, water drops on automobile bodies can be easily blown down, and the compressed air profiling blowing device is effective in blowing, simple in structure, convenient in mounting and low in investment cost.