Roof drainage combination device

The utility model relates to the technical field of buildings, in particular to a roof drainage combination device which comprises a pre-buried sleeve and a rainwater grate, the rainwater grate is connected with the pre-buried sleeve in an up-down mode, an annular edge is arranged at a port of the pre-buried sleeve, a water stop annular belt is arranged below the edge of the port of the pre-buried sleeve, and the rainwater grate comprises a three-dimensional rainwater grating. A clamping ring is arranged on the bottom face of the three-dimensional rainwater grating outwards, the lower end of the three-dimensional rainwater grating is connected with the filter screen, the pressing ring is arranged at the lower end of the filter screen, and two adjusting notches are formed in the lower end of the pressing ring. By using the roof gutter inlet combination device provided by the utility model, the existing defects of the existing roof drainage combination are effectively overcome, and the anti-seepage and anti-blo