The invention discloses a multi-defense wireless network security protection system and method. The wireless network security protection system comprises a security authentication system, a wireless intrusion protection module, an ARP (Address Resolution Protocol) protection module and a data transmission monitoring module, wherein the security authentication system comprises a DHCP (Dynamic Host Configuration Protocol) server, an MAC (Media Access Control) address authentication system and a portal authentication system. Through adoption of the security protection system, on the three aspects of wireless authentication security, wireless security protection and cable network security, effective and comprehensive security protection is performed on a wireless network system from a plurality of angles.