Building construction rainfall drainage structure

The utility model discloses a building construction rainfall drainage structure which comprises a house, a drainage base is arranged on the roof of the house, a conical face is arranged at the upper end of the drainage base, a receding groove is formed in the upper end of the drainage base, an auxiliary plate is installed in the receding groove in a threaded mode, a drainage groove is formed in the lower end of the auxiliary plate, and the drainage groove is communicated with the receding groove. A rain collecting plate is arranged at the upper end of the drainage base, conical meshes are formed in the upper end of the rain collecting plate, a filter screen is welded to the upper end of the rain collecting plate, a rain drainage hole is formed in one end of the house, a rain drainage pipe is installed on one side of the house through screws, and the rain drainage pipe is communicated with the rain drainage hole. Rainwater on the roof can be effectively drained in a concentrated mode, meanwhile, the rainwater