The invention discloses a design method for a power transmission line iron tower without a ground wire, and the method comprises the following steps: s1, removing the ground wire and a ground wire support, and obtaining related parameters; s2, calculating load and resistance borne by the iron tower before and after the ground wire is cancelled, and establishing a simulation model; s3, performing the simulation calculation tower material stress, tower head maximum deformation quantity and foundation bottom surface pressure of the front iron tower and the rear iron tower without the ground wire; s4, calculating a reliability index of the iron tower after the ground wire is cancelled; s5, comparing the internal stress distribution of the front and rear iron towers without the ground wire, the maximum deformation quantity of the iron towers, the foundation bottom surface pressure and the reliability index; s6, reducing a certain proportion according to a comparison result; and obtaining the internal stress distribution of the iron tower after the ground wire is cancelled, the maximum deformation quantity of the iron tower, the maximum reduction value that the foundation bottom surfacepressure is less than or equal to the numerical value before the ground wire is cancelled and the reliability index of the iron tower is not less than 4.2, and corresponding iron tower structure parameters. The method solves the problem that the original iron tower design method is not suitable for iron tower design after the ground wire is cancelled.