The invention discloses an identity-based designated tester searchable encryption method in cloud storage. The steps includes: 1. initialization of system parameters; 2. generation of a private key of a server; 3. generation of a private key of a data receiver; 4. encryption of a keyword by a data owner; 5. generation of a trap door; and 6. testing. According to the identity-based designated tester searchable encryption method provided by the invention, only an authorized cloud storage server can execute storage and retrieval, thereby resisting an attacks of a malicious cloud storage server, the data owner can store data in a designated cloud storage server after encryption of the data and the extracted corresponding keyword, and only the designated cloud storage server can retrieve required ciphertext data and transmit to the data receiver, thereby solving the problem existing in the prior art that the malicious cloud storage server reveals data that a user searches in the process of executing a search.