The utility model discloses a formula of covering delivery port structure in tunnel heat preservation escape canal, bury drainage hidden pipe and terminal drainage hidden pipe deeply between the concrete foundation of the heat preservation backfill layer that is located upper portion and lower part, the tip of terminal drainage hidden pipe is provided with anti dashing and grinds the honeycomb duct, and anti dashing is ground the honeycomb duct below and be provided with cyclic annular joist, and the below of cyclic annular joist is provided with U type water drainage tank, and the water the tunnel in is through bury the drainage hidden pipe through terminal drainage hidden pipe and anti strong honeycomb duct inflow U type water drainage tank, the tunnel of discharging rapidly of grinding deeply. The utility model discloses a formula of covering delivery port structure in tunnel heat preservation escape canal can effectively avoid owing to the freeze injury that tunnel delivery port drainage did not freely cause, and greatly reduced gets into the inside adverse effect who causes of drainage hidden pipe because the cold air to the wind belt of horizontal direction, further improves cold area tunnel winter protection water discharge ability to make things convenient for the maintenance repair.