The utility model discloses an adjustable cable conductor positioning tray which comprises a chassis, an installation base and a clamping apparatus arranged on the installation base, wherein the installation base is provided with four positioning pins and is located on the chassis through the positioning pins; the clamping apparatus comprises two corresponding single clamping pieces, each single clamping piece comprises a clamping groove base, and each clamping groove base is provided with a clamping groove; and movable lug blocks are assembled in the clamping grooves and are connected with spiral lead screws which are connected lead screw handles. According to the adjustable cable conductor positioning tray, the lead screw handles rotate to push the movable lug blocks to move back and forth, a cable conductor is positioned on the whole tray through the four positioning pins on the installation base, and thus the distance between the two single clamping pieces is rapidly and conveniently adjusted to adapt to cable conductor discs with different specifications. The adjustable cable conductor positioning tray is low in cost and good in universality.