The invention relates to a defect analysis method for a 410 material forging. The defect analysis method comprises the following steps: 1, determining of a forging material; 2, ultrasonic flaw detection; 3, dissecting and sampling; 4, low-power macroscopic inspection, 5, metallographic inspection, 6, scanning electron microscope inspection and 7, conclusion analysis. According to the method, ultrasonic flaw detection, dissection and sampling, low-power macroscopic examination, metallographic examination, heat treatment examination and scanning electron microscope examination are carried out on the forged round blank and the round bar forge piece, specific defect types on the forged round blank and the round bar forge piece are gradually examined, formation reasons of defects are compared and analyzed, instructive suggestions are provided for eliminating the defects, resource waste caused by quality defects in the production process of forged round blanks is reduced, scrapped parts of round bar forgings in the forging process are reduced, essential reasons for defect generation are found, and waste of manpower and material resources caused by repeated defect detection is avoided.