The embodiment of the invention provides a digital certificate synchronization method, a digital signature server and a digital certificate synchronization system, and relates to the technical field of network security. According to the method, the server and the system, the problem that according to existing digital signature servers, digital certificates are downloaded repeatedly when the digital certificates not existing in the digital signature servers are downloaded. The method comprises the steps that the digital signature servers receive signature verification requests; when it is determined that the digital certificates indicated by the signature verification requests do not exist in the digital signature servers, and the digital signature servers are configured as center servers, the digital certificates indicated by the signature verification requests are searched on other servers configured as the center servers in sequence; and when it is determined that the digital certificates indicated by the signature verification requests do not exist in the digital signature servers, and the digital signature servers are configured as non-center servers, the digital certificates indicated by the signature verification requests are searched on other center servers in sequence; and when the digital certificates indicated by the signature verification requests are searched, the digital certificates indicated by the signature verification requests are download. The method, the server and the system are used for synchronizing the digital certificates.