Network access control method and device, system, equipment, medium and product

The invention provides a network access control method and device, a system, equipment, a medium and a product. The network access control method comprises the following steps: collecting network flow data generated when an access device accesses a network; analyzing the network flow data, and determining whether the access of the access device to the network is abnormal access; and sending an instruction of releasing or blocking the access of the access device to the network based on a result of determining whether the access of the access device to the network is the abnormal access. According to the scheme of the embodiment of the invention, a client does not need to be installed in the equipment, whether the equipment is the abnormal access equipment or not is automatically judged directly according to the captured network flow data, the abnormal access equipment can be more accurately determined, the access of the abnormal access equipment to the enterprise intranet is blocked, and the safety and protect