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Although a diffuse-type giant cell tumor is a rare benign lesion, when it develops it tends to localize to the tendons of the hand and foot. In this study, we report the case of a 41-year-old male patient who was diagnosed with diffuse-type paratenon giant cell tumor involving the Achilles tendon. The duration of the bilateral tumors was 8 years. He visited first affiliated Hospital of Wenzhou Medical University for medical attention. Both his Achilles tendons required removal. The reconstructed Achilles tendon was replaced using tissue derived from the knee and foot. Postoperatively, the patient recovered well and regained full range of motion in the ankle. The use of autografts may shorten patients' recovery period.