The paper introduces the study on stress distribution of steel strand in anchoring section of concentrated tension pre-stressed anchor cable by magnetic flux sensor, the stress transfer and distribution of steel strand in anchoring section are analyzed. Combined with long-term monitoring, the steel strand stress loss in anchoring section and the laws of stress distribution adjustment of steel strand in anchoring section before and after stretch locking are analyzed. The study and the application show that magnetic flux sensor technology can be an effective method for basic cable test and steel strand stress distribution detection in other tests.