The mass work network for eliminating the four pests refers to a highly active and participatory network organization structure spontaneously formed by the masses in a specific field. This kind of network structure is usually used to carry out four defenses, such as reverse osmosis, psychological warfare, strategy and theft, and is the content of unremitting struggle on the hidden front. Through the "four evils" mass work network, we can better discover and prevent the infiltration, destruction and subversion of hostile forces and safeguard national security and social stability.