Embodiments of the invention disclose a data encryption method, comprising: obtaining an operation parameter input by a user through an operating rod type crown of a smart watch, wherein the operation parameter is at least one of the following parameters: toggling direction, toggling number, toggling time, toggling frequency, toggling rhythm and toggling force; and encrypting data stored in the smart watch according to the operation parameter. By adopting the data encryption method disclosed by the embodiments of the invention, the data in the smart watch can be encrypted according to the operation parameter, thereby simplifying the encryption process, avoiding inputting a password on the display screen of the smart watch, improving the password input accuracy and improving the user experience at the same time.