Communication link encryption system and encryption method suitable for unmanned aerial vehicle

The invention discloses a communication link encryption system and encryption method suitable for an unmanned aerial vehicle. An unmanned aerial vehicle end encryption system comprises an unmanned aerial vehicle end data transmission module used for sending data to a ground end equipment encryption system and receiving data from the ground end equipment encryption system; the unmanned aerial vehicle end key database module is used for storing or changing a key; the unmanned aerial vehicle end encryption module is used for encrypting or decrypting the unmanned aerial vehicle end data through the secret key; the ground end encryption system comprises a ground end data transmission module used for sending data to the unmanned aerial vehicle end equipment encryption system and receiving data from the unmanned aerial vehicle end equipment encryption system; the ground end key management module is used for generating, storing or changing a key; and the ground end encryption module is used for encrypting or decrypti