The invention discloses an internet printing security management system for a U disk, comprising a first client (1), a firewall (2), a first router (3), a database server (4), a central server (5), asecond client (6), a second router (7), and a management machine (8), wherein U disk protection walls (9) are provided in both the first client and the second client, the first client is in communication connection with the firewall via the internet (10), the firewall is in communication connection with the first router, the second client is in telecommunication connection with the second router,the second router is in telecommunication connection with the management machine, the second router is in communication connection with the firewall through a VPN gateway (11), the first router is incommunication connection with the database server and the central server respectively through an internal network (12). According to the internet printing security management system for the U disk, the system can achieve transparent encryption and high strength, and prevent data leakage and the loss and destruction of the U disk.