The invention discloses a network security implementation system and method based on a big data platform in the technical field of network security. The network security implementation system comprises an intranet detection system, a client, a local area network, a visitor verification system, a switch, an enterprise router, a firewall, a feedback system, a sensitive information filtering system, an access flow control system, a behavior log library, a cloud server and a big data memory; the intranet detection system detects the network distribution and the network environment where the client is located, the intranet detection system removes and alarms the problems and potential safety hazards of the network system where the client is located, the intranet detection system is connected with the client, and the network security implementation system based on the big data platform performs access detection through multiple layers of security monitoring systems and provides a secure use environment for the network platform.