The utility model provides a curtain is with thermal -insulated conversion section bar, includes section bar no. 1 and section bar no. 2, and section bar no. 1 is opened towards the one side of section bar no. 2 has dovetail no. 1, and section bar no. 2 is opened towards the one side of section bar no. 1 has dovetail no. 2, and the both ends of heat insulating strip be the trapezium structure, and one end and dovetail no. 1 mate and is connected in dovetail no. 1, and the other end and dovetail no. 2 mate to be connected in dovetail no. 2, and wherein, section bar no. 1 one side of section bar no. 2 dorsad passes through the screw and is connected the utilization with the latent frame curtain of the rectangle perpendicular lower border of enduring the utility model discloses, can conveniently will conceal the straight vertical stroke that converts thermal -insulated curtain to of vertical stroke of frame curtain endures to the reduction reduces section bar manufacturing cost with a series of section bar varieties and mould quantity.