To explore the clinical efficacy of the surgical technique in the treatment of Haglund""s syndrome using complete detachment and reattachment of the Achilles tendon. [Methods] From January 2017 to January 2019, the data of 26 patients with Haglund""s syndrome treated by complete detachment and then reattachment of the Achilles tendon through the posterior midline approach were retrospectively analyzed. Fowler-Philip angle (FPA), parallel pitch lines (PPL), visual analogue scale(VAS) pain score, and AO-FAS ankle-hindfoot score were measured and compared before operation and at the last follow-up. The radiographic and magnetic resonance imaging were summarized. [Results] All patients were followed up with an average ( 22.3±9.5) months. Among the 26 patients, there were 21 cases (80.8%) of Achilles insertional calcification, 6 cases (23.1%) of bone marrow edema of the superior calcaneal tuberosity, 20 cases (76.9%) of insertional Achilles tendinopathy, and 20 cases (76.9%) of retrocalcaneal bursitis, and 4 cases (15.4%) of retro-Achilles bursitis. The VAS score decreased from (5.3 ± 1.9) preoperatively to (1.1 ± 0.8) at the latest follow-up visit, and the AO-FAS score increased from (62.6 ± 8.4) preoperatively to (89.6 ± 5.1) at the latest follow-up visit, the differences were statistically significant (P <0.01). There were no complications such as nerve injury, infection, Achilles tendon rupture, and insertional avulsion. [Conclusion] Haglund""s syndrome is associated with a variety of lesions. The technique of complete detachment and then reattachment of the Achilles tendon offers precise exposure and excellent visualization, can completely remove the lesion tissue, has few complications, and has a good clinical effect. It is an optional surgical technique.