The invention discloses a drainage wire insulation support. The drainage wire insulation support comprises a fixed groove box of which the cross section is in a U shape, and connection rods are arranged at the left end and the right end of the outer side surfaces of flange plates of the fixed groove box respectively. The lower ends of the connection rods are connected with the flange plates of thefixed groove box through connection shafts, and the upper ends of the two connection rods connected with the same flange plate of the fixed groove box are hinged through first hinging shafts. Hanginghooks matched with a cross rod are arranged on the hinging shafts. Telescopic groove boxes of which the cross section is in a U shape are arranged at the left end and the right end inside the fixed groove box respectively, and a first slide groove used for accommodating the corresponding connection shaft is formed in the flange plate of each telescopic groove box. The fixed groove box, the telescopic groove boxes and the connection rods are all made of an insulation material. When an insulation drainage wire is fixed, the number of tools for use is obviously reduced by using the insulation support, the work intensity is lowered, and the work efficiency is improved.