The Second Hospital of Changsha Public Security Bureau can reissue the security certificate. If the security certificate is lost, you can apply to the security training institution and reissue it after being confirmed by the local public security organ. The Second Hospital of Public Security has the responsibility to reissue the security certificate, so the Second Hospital of Changsha Public Security can reissue the security certificate. According to the Regulations on the Administration of Security Services, security guards must hold relevant certificates.