Access control method and system for wireless hotspot based on dynamic keys

The invention discloses an access control method and system for a wireless hotspot based on dynamic keys. The method comprises that: after being connected with a terminal, a wireless hotspot end sends a first public key and a first private key to the terminal, and meanwhile, stores a second private key and a second public key corresponding to the first public key and the first private key respectively; after the terminal is connected with the wireless hotspot end, when the terminal does not receive the first public key and the first private key sent by the wireless hotspot end within a preset time period, the terminal is disconnected from the wireless hotspot end; after receiving a terminal disconnection instruction, the wireless hotspot end sends a request for acquiring an access password and an MAC (Multimedia Access Control) address to the terminal; and the wireless hotspot end receives the access password and the MAC address sent by the terminal, matches the access password and the MAC address with an access password and an MAC address in a preset database, and judges whether the terminal is allowed to access the network via the judgment result. The method and the system solve the problem of data transmission security of an internal information system of a local area network.