A wireless communication device includes a substrate and a tunable antenna. The substrate has a signal source. The tunable antenna includes a metal cover and at least one matching circuit. The metal cover serves as a cover of the wireless communication device, and includes a radiation body, a main body, and a dielectric member coupled between the radiation body and the main body. The radiation body is coupled to the signal source and dielectric relative to the main body. The at least one matching circuit is configured to switch between multiple working mode to enable the radiation body to receive and send wireless signals at different frequency bands.