The utility model discloses a double-layer cable channel cover plate. The double-layer cable channel cover plate comprises an upper-layer cover plate and a lower-layer cover plate, wherein the upper-layer cover plate and the lower-layer cover plate are articulated through a hinge, the lower-layer cover plate is provided with a honeycomb breathing hole, the upper-layer cover plate is provided with a stainless steel pull ring and an observation hole, and the observation hole is internally clipped with tempered glass. According to the utility model, humidity and temperature of the upper-level air in the cable channel can be clearly seen from the tempered glass observation hole on the upper-layer cover plate, so that ventilation can be conveniently and timely realized when the humidity is larger; and the upper and lower-layer cover plates are connected through the hinge. When the cable channel needs to be ventilated, the pull ring is pulled so as to open the upper-layer flat cover plate with ease, then a honeycomb grid is exposed and moisture in the cable channel can be easily convected and evaporated. When in rain and snow weather, the upper-layer flat cover plate can be covered on easily, so that rainwater and snow water can be difficult to flow in the cable channel, thus the double-layer cable channel cover plate can provide double advantages from one effort.