The invention discloses a secure deletion method for data in a solid-state disk on the basis of a flash memory. The characteristic that multiple data channels in the solid-state disk can be operated in parallel is utilized, an improved secrete sharing scheme is adopted to conduct conversion processing on data, and encoded data is distributed to all the data channels; on one hand, data redundancy is guaranteed through encoding, the converted data is ciphertext, and the reliability and the security of the data are improved; on the other hand, the error-resilient encoding characteristic is utilized, covering on the whole data is not needed any more for deletion of the data, partial data is deleted, the data integrity is destroyed, and the data cannot be recovered. Even though an attacker obtains partial encoded data, the attacker cannot obtain plaintext, and the purpose of securely deleting the data is achieved. By means of the secure deletion method for the data in the solid-state disk on the basis of the flash memory, the data storage security problems that storage of the solid-state disk is unreliable, and files cannot be deleted securely are solved.