Background Radiation ulcers that develop after breast cancer surgery are mainly repaired with pedicled flaps or free flaps rather than local random flaps or skin grafts due to large skin defects and poor wound healing. Complicated surgical techniques and donor site reconstruction increase the risk of failure. We report our experience of using the local random long neck reading man flap (LNRMF) to cover large chest wall radiation ulcers, achieving good outcomes. Methods Eight patients who developed chest radiation ulcers after breast cancer surgery and were treated between January 2024 and June 2024 were included. The duration of the wounds ranged from 8 to 35 days. Necrotic and ischemic tissues were completely surgically removed, and subsequent wounds were repaired with LNRMFs. The wounds ranged from 6 cm × 8 cm to 15 cm × 16 cm in size. Visual analog scale scores were recorded during therapy. Results Eight patients healed well after the first stage. The sutures were removed 10–17 days (average, 12.63 days) after surgery, and no infections, necrosis, or necrotic skin flaps were observed. The average Visual analog scale score was 2.5. The follow-up period was 2–6 months (mean, 4.7 months). Slight linear scarring was observed, and no limitations in shoulder elevation were observed in seven patients; however, 1 patient had slightly limited shoulder elevation. The average SCAR scale score was 3.88, and all sensation scores (according to the Medical Research Council scale) were S3+. Conclusions LNRMFs are easily created and effectively repair secondary wounds that develop after the resection of radiation ulcers that develop after breast cancer surgery and large skin defects. These flaps can be widely used and should be promoted at the grassroots level.