Data transmission method, system and device and storage medium

The invention discloses a data transmission method, system and device and a storage medium, and relates to the technical field of communication, the method comprises the following steps: a first data processing unit receives a first data packet of a first container, matches an encryption key according to a source address and a destination address of the first data packet, and if the encryption key corresponding to the source address and the destination address exists, sends the first data packet to a second data processing unit; encrypting the first data packet by using the encryption key to obtain a second data packet; sending a second data packet to a second data processing unit; the second data processing unit matches the decryption key according to the destination address and the security parameter index of the second data packet; if the decryption key corresponding to the destination address and the security parameter index exists, decrypting the second data packet by using the decryption key to obtain a