The invention relates to a system of fabricating electronic seals, which includes an interface module, a certificate management module and an electronic seal fabrication module, wherein, the electronic seal fabrication module is connected with the interface module and the certificate management module, the electronic seal fabrication module is used to establish an association relation between theseal pattern data of a user and the digital certificate of the user in order to fabricate an electronic seal. The invention also discloses a method of fabricating electronic seals, which is based on the system and includes three steps. Firstly, a seal identifier is generated according to the seal pattern data; secondly, authentication information is generated with a key identification number, a user identification name, a seal identifier and seal information; thirdly, the seal information, the seal identifier, the authentication information and the digital certificate of the user are stored as the electronic seal of the user. On the premise of ensuring the integrity, authenticity and incontestability of a signature, the invention can ensure that the seal has the similar visual effect of the traditional signatures.