Abstract: According to the requirements of large data collection and strong information confidentiality of intelligent coal preparation plant, a standardized network construction scheme, multi-layer switching network topology, is designed and successfully applied in Xiayukou coal preparation plant. The network link of coal preparation plant is designed into wired equipment network, wireless office network, production control network and industrial video network. Through access, aggregation and core three-layer switches, data can be forwarded at high speed and intelligent interaction. At the same time, the network security system is designed, firewalls are set up in the internal and external network of the coal preparation plant, and security devices such as log audit, fortress machine and backup machine are deployed in off-line, and management system constraints are supplemented to ensure the network security of the coal preparation plant. After engineering verification, the performance of the four kinds of networks has reached the expectation, and passed the "equal guarantee level two" security evaluation. The design scheme has good economic efficiency and significant social benefits, and can realize the safe and stable operation of the intelligent system. The construction results can be used for follow-up reference.