Cross-organization communication method and device based on multi-level block chain, and medium

The invention discloses a cross-organization communication method and device based on a multi-level blockchain and a medium. The method comprises the steps: enabling a first organization to generate a communication invitation for initiating communication to a second organization and sending the communication invitation to a mother blockchain network in the multi-level blockchain; sending a communication invitation initiated by the first organization to the second organization through a key management center of a mother blockchain network in the multi-level block chain, and determining whether the second organization agrees with the communication invitation. According to the embodiment of the invention, a more convenient, quicker and safer invitation reply mechanism and routing process are realized through a layered block chain system, and a public and private key system on the block chain is utilized to ensure that the invitation and reply of communication and the specific information transmission in the comm