Roof cornice waterproof structure for building

The utility model discloses a roof cornice waterproof structure for a building, relates to the technical field of roof cornice waterproofing, and is used for solving the problems that a waterproof structure of a cornice is easy to block after being used for a long time, and impurities are inconvenient to treat in a centralized manner. Through two groups of sliding blocks and two groups of reset springs, a driving rod rotates to drive a rotating plate to rotate to upwards extrude the other side of the filter screen, so that the two groups of sliding blocks extrude the two groups of reset springs in the two groups of sliding grooves, the two groups of reset springs are extruded to rebound, and the filter screen is quickly reset; the vertical reciprocating motion of the other side of the filter screen is achieved, so that impurities attached to the top of the filter screen are shaken off into the pollution discharge box through the open groove, the phenomenon that the filter screen is prone to being blocked afte