The invention discloses a privacy control method and system applied to Internet of things remote control. The privacy control method comprises the following steps: using different storage positions of a key sequence in a storage as common keys, synchronously updating the common keys each time an encryption operation is performed on a command, and using the updated common keys as parts of a ciphertext command; and when decryption is performed at a receiving end, reading the common keys in the ciphertext command firstly to obtain a storage position of a key, reading the key, and decrypting the ciphertext command. Through adoption of the privacy control method and system, a quantum true random number, namely, a reliable true random number key source is utilized, and a one-time one-key encryption algorithm is adopted, so that absolutely-safe privacy control can be realized among Internet of things remote wireless communication equipment based on remote safe control developed by the system.