The utility model discloses a ventilative formula cable trench cover, including gas permeable plate, handle and support frame, the last distribution of gas permeable plate sets up a plurality of bleeder vents, the gas permeable plate below is equipped with the support frame, the support frame is equipped with 15, and the center that 15 spinal branch strut equipartitions were arranged below gas permeable plate is located, the handle is equipped with 2, sets up on second spinal branch strut and the 14 spinal branch strut two respectively the handle passes gas permeable plate respectively and links to each other with second spinal branch strut, the 14 spinal branch strut. The utility model discloses can alleviate apron weight, the staff's operation of being convenient for has improved the operating efficiency greatly, utilize gas permeable plate to realize outer automatic the taking a breath of cable pit septal fossula, the ventilative tide that removes improves cable operational safety, the high strength support frame improves apron support ability, and guarantee staff safety is worth wideling popularize.