Tax UKey-based invoice issuing method and system

The invention discloses a tax UKey-based invoice issuing method and system, and belongs to the technical field of tax informatization. The method comprises steps of applying for a tax administration UKey conforming to the specification for individuals/enterprises; confirming personal/enterprise information through the authentication code, and performing association; submitting a certificate application request; generating a cloud invoicing certificate; storing the cloud invoicing certificate in a security area of a server; confirming personal/enterprise identities; verifying the ciphertext signature, and encrypting the ciphertext by using the component key stored in the server after the verification is passed; decrypting the ciphertext by using the tax Ukey and the component key stored inthe server to obtain decrypted information, and storing the decrypted information in a security area of the server; and receiving an invoice issuing request of a person/enterprise, carrying out real-name authentication on the