The invention discloses an identity-based encryption method allowing revocation at the lattice, and specifically includes the steps of: 1. establishing an algorithm; 2. establishing a private key generation algorithm; 3. updating a secret key generation algorithm; 4. decrypting the secret key generation algorithm; 5. encrypting an algorithm; 6. decrypting the algorithm; and 7. revoking the algorithm. The identity-based encryption method allowing revocation at the lattice adds a user identity revocation mechanism, and thus identity management of user can be effectively realized; and the method is based on the problem of LWE difficulty at the lattice, can resist quantum attack, has relatively high computational efficiency, proves that the scheme is adaptively safe, security of the scheme is stipulated to the problem of LWE difficulty, and the problem existing in the prior art that an encryption method causes disclosure of a user private key and difficulty in resisting quantum attack.