The utility model discloses a damp ventilation cover plate is arranged to cable channel, include: the upper cover plate, it is the rectangle box body describes, rectangle box body lower extreme is for opening the form, the surface of upper cover plate covers and has anti - lac varnish, the internal surface of upper cover plate covers and has the reflective membrane, lap down, it sets up to bilayer structure, and the lower floor is metal mesh layer, and the upper strata is metal keel frame layer, the hinge, it is connected with upper cover plate and the side of lapping down respectively, so that the upper cover plate can turn over the book for lapping down. The utility model provides a damp ventilation cover plate is arranged to cable channel solves present cement and pours off -the -shelf shortcoming, can carry out row tide and ventilate or get rid of foul smell to reach firm, as to have protection network, safety warning warning mesh.