Abstract: Ciphertext policy attribute-based encryption (CP-ABE) technology is the focus and difficulty of access control research in smart grid. However, in the conventional CP-ABE scheme, there are some problems such as access policy divulging user privacy, large amount of computation and low efficiency. To solve these problems, an efficient and revocable attribute-based access control scheme for smart grid is proposed. Online/offline encryption and outsourcing decryption were used to improve the efficiency of the system. Chameleon Hash function was used to realize safe user and attribute revocation. Security analysis and performance analysis proved the security and computing advantages of the scheme.