With the increasing impact of climate change on the power transmission system, icing monitoring has become one of the key technologies to ensure the stable operation of the power grid. The existing solution is based on the ice cover weighing method for calculating the ice cover thickness. However, over time, excessive ice cover can cause creep of the tension sensor, resulting in inaccurate measurement of the tension value, and the original reference tension is constantly changing. This can lead to the inability to directly monitor the actual ice cover thickness using the weighing method. This study proposes a new method for ice cover monitoring based on tension correction, which significantly improves the accuracy of ice cover thickness measurement by continuously correcting the original tension values. This study includes two innovative icing monitoring techniques: one is tension correction based on temperature regulation, and the other is to correct the current icing value by analyzing the temperature change trend and the previous icing monitoring value when the tension oscillation is not accurate. By analyzing the data and images exported from the installed lines, it has been proven in practice that this method can effectively reduce errors and improve the accuracy of ice monitoring. This study is of great significance for improving the operational safety of the power system under adverse weather conditions.