Trusted electronic signature system based on official account

The invention belongs to the technical field of communication, and discloses a trusted electronic signature system based on an official account, which comprises a mobile terminal, a wechat platform, a security gateway device, a signature service server, a collaborative signature system server and an application system server, and is characterized in that the collaborative signature system server is provided with a quantum cryptographic card; the mobile terminal, the wechat platform, the signing service server and the application system server are used for cooperatively performing user identity authentication; the mobile terminal and the collaborative signature system server are also used for collaboratively applying a certificate based on a back-end random number generated by the quantum cryptographic card after the identity authentication of the user is passed; the mobile terminal and the collaborative signature system server are also used for collaboratively signing the to-be-signed message after the certif