The utility model discloses an electric heating tube assembly frame which comprises a supporting frame and a plurality of supporting rods. The supporting frame is a frame formed by four vertical columns and a plurality of connection rods which are connected to the four vertical columns. The four vertical columns are respectively arranged at four vertices of a rectangular, the supporting rods are arranged at two opposite sides of the supporting frame in one-to-one correspondence. An isolation layer is formed by each two opposite supporting rods in the supporting rods. An electric heating tube can be supported, fixed and isolated by a plurality of isolation layers, the distance between adjacent isolation layers is matched with the diameter of a supported electric heating tube, and the distance between two opposite sides of the supporting frame is smaller than the length of the electric heating tube. By adopting the electric heating tube assembly frame of the utility model, the working of installing a flange on the electric heating tube can be easily completed with only one person, which is convenient and labor-saving.