The invention discloses a campus network IPv6 address division method based on a Merkle tree. The method comprises the following steps: A, performing information authentication when a device accessesa campus network for the first time; B, dynamically allocating a temporary IPv6 address through a DHCPv6 server; C, providing, by a Portal Server, an authentication page for a user, and filling, by the user, relevant attributes; D, obtaining, by an authentication center, user attributes, constructing the Merkle tree, and matching the Merkle tree with Hash values of the user attributes in a database; E, in the case of matching success, allocating, by an SDN switch, an IPv6 address to the user according to the Merkle tree, and binding the IPv6 address with an MAC address of the device, and in the case of matching failure, positioning the incorrectly filled attribute and notifying the user of IPv6 address allocation failure; and F, by adoption of the method, allocating a unique IPv6 address to each network terminal of the school, and analyzing, by a campus network center, the Internet access situations of teachers and students in the school according to the method. The method is proposedon the basis of the IPv6 used in the campus network at present and has certain practicality.