The article presents the system of detection of ground wire defects based on the analysis of loss of metallic area (LMA) and local flaws (LF) diagrams for Cablewalker complex. The system consists of two modules: a module for reading data from a magnetic scanner and a module for analyzing data and generating a report on detected defects. The first module reads the data of LMA and LF diagrams from the magnetic scanner in the form of a binary file and transmits them to the second module. The data analysis module removes noise from the diagrams and identifies the peaks of the diagrams corresponding to the defects of the ground wire. Highlighted peaks are marked in their intensity. To do this, we have entered the colour scheme: green, yellow, red. The green level corresponds to the low intensity of peak, the yellow level is used for average intensity and red level indicates the most intense peaks. Peaks of the red level indicate the most dangerous defects. The system generates a graphical text report containing diagrams with marked peaks and a description of the defects with their location on the ground wire. The system is tested on laboratory data. Test results have shown that the system found all the defects applied to the ground wire. Thus, we have obtained the system for recognition of ground wire defects using the LMA and LF diagrams data.