Security control method and device, central coordinator, site node and storage medium

The invention discloses a security control method and device, a central coordinator, a site node and a storage medium. Under the condition that the security mode of the electric power communication network is an unencrypted mode, the station node sends a network access request (i.e., sends a first network access request) to the central coordinator CCO for the first time, and the central coordinator CCO decides whether to start the encryption mode according to the communication type of the station node attached to the first network access request; and if the security mode of the electric power communication network is set as an encryption mode, the station node sends a network access request (i.e., sends a second network access request) to the central coordinator CCO for the second time so as to carry out networking again. Therefore, safety control is realized on the basis of normal communication, safety communication between the central coordinator CCO and the station node STA is improved, and the occurrence