The invention discloses a dynamic port desktop access management method and system. The method comprises: a client initiates desktop access to a desktop access dynamic port control system through a client, and establishes a control surface connection; the desktop access dynamic port control system randomly distributes the dynamic access destination connection information and configures the conversion information from the dynamic access destination connection information to the host destination connection information; the client initiates to establish the data plane connection according to thedynamic access destination connection information; the desktop access dynamic port control system establishes the destination virtual host desktop access according to the conversion information through the data plane connection. The invention only accepts the connection of the dynamic access destination connection information allocated after the authentication of the control plane is passed through the data plane, controls the timeliness of the destination connection to effectively prevent DDOS attacks on the data plane and violent cracking means, reduces the probability of successful connection of the attackers who initiate desktop access connection attempts, improves the security of the system, prevents data loss, service degradation, and so on.