The invention discloses a heat insulation drainage ditch used at two sides inside a tunnel. The heat insulation drainage ditch comprises a side ditch, a lower layer cover plate, a heat insulation layer and an upper layer cover plate, wherein the lower layer cover plate is arranged on the side ditch; the heat insulation layer is arranged on the lower layer cover plate; the upper layer cover plate is arranged on the heat insulation layer; the width of the lower layer cover plate and the width of the heat insulation layer are identical to the width of the side ditch; support elements are symmetrically arranged on the side walls of the side ditch; and the bottom of the lower layer cover plate is in butt connection with the top of the support elements. By using the heat insulation drainage ditch provided by the invention, the width of the heat insulation layer of the heat insulation drainage ditch can be effectively reduced; further, the cross section area of the tunnel can be effectively reduced; the cost is reduced; and the investment is reduced.