Abstract: A rain erosion test device includes an integrated double-wing blade and a drive assembly. The integrated double-wing blade is symmetrical around the center of the integrated double-wing blade, and rotatable around the center in the horizontal plane. A rain erosion sample mold fixing mechanism is provided on a leading edge adjacent to each of two ends of the integrated double-wing blade. The drive assembly is configured to drive the integrated double-wing blade to rotate. The blade of the rain erosion test device has simple machining and a low cost, and can still operate stably when a weight difference between two ends of the blade is up to 1 kg so as to achieve a high error-tolerant rate. The rain erosion test device can realize continuous test on rain erosion resistance of the coating at a speed of 207 m/s or more.