Fast-draining rain cap

The utility model discloses a fast-draining rain cap comprising a cap portion configured with a conicity, the diameter of the lower end of the cap being larger than that of the upper end, the surface of the cap portion being provided with plural draining gratings around the circumference of the cap, wherein the drainage gratings are configured in shape of triangle prism upon horizontal projection, spacing of the bottom of the drainage gratings being larger than that of the top; wherein the top of the cap portion is provided with dredge holes. The utility model can directly be fastened to the drainage outlet and block junks in the periphery of the cap portion, thereby making possible for accumulated water to be drained to the pipe system from drainage gratings. As the accumulated water is drained completely, leaves and other solid junks in the periphery of the drainage outlet can be blown away by strong wind generated by passing subway vehicles. Therefore, the utility model can satisfy drainage requirements of