Background Donor-derived malignancy is sometimes unidentified at the time of transplantation, resulting in unanticipated donor-derived malignancy, which becomes a notable problem since the increasing use of marginal donors. Case presentation We first report three cases of donor-derived synovial sarcoma from a single multiorgan donor in China. The donor was died of respiratory failure caused by an intrathoracic tumor, which was diagnosed as a benign tumor at the time of donation. All of the three recipients developed synovial sarcoma within 3 months to 13 months after transplantation, proven to be donor-derived. Liver transplant recipient died of tumor metastasis. Two kidney transplant recipients survived from metastases by comprehensive therapy, including the first use of Anlotinib, exhibiting an effective anti-tumor activity.Conclusions This report highlights the importance of detailed donor assessment, close follow-up and timely treatment, as well as the need for establishing a post-transplant surveillance system for donor-derived transmission events. Whether to use organs from a donor with initial diagnosis of benign tumor needs to be cautious. Malignant potential of tumors needs to be excluded before transplantation, otherwise, the organs should be discarded.