Positioning tool

The utility model provides a positioning tool which solves the technical problems that in the prior art, precision errors exist in installation of an antenna pedestal, and efficiency is low. The positioning tool is used for positioning the installation position of an antenna pedestal on a heat insulation carriage with a positioning face and an installation face which are perpendicular to each other, the positioning tool comprises a positioning piece, a horizontal datum and a fixing device, and the positioning piece comprises a first end and a second end which are perpendicular to each other; the first end of the positioning piece is in contact with the positioning surface to form a positioning reference of the antenna pedestal, and the second end of the positioning piece is in contact with the mounting surface to position the mounting position of the antenna pedestal; the horizontal reference is used for determining that the positioning piece keeps horizontal after the second end contacts with the mounting su