The invention provides user equipment and a data transmission method. The user equipment comprises a controller, a housing and a metal plate, wherein the controller is arranged in the housing, and the metal plate is insulated from the housing; the controller is electrically connected with the metal plate; and the metal plate is used for, when the user equipment approaches another user equipment, forming a parallel plate capacitor with the metal plate in another user equipment so as to enable the controller of the user equipment and the controller of another user equipment to transmit AC signals through the parallel plate capacitor. According to the user equipment and data transmission method provided by the invention, data can be transmitted normally only when the distance between the two pieces of user equipment is quite close and the data cannot be transmitted normally as long as the distance is slightly far. As a result, only equipment close to the user equipment can receive the data, other equipment cannot receive the data, and thus the data transmission security is effectively improved.