The invention relates to a method and device for determining the working state of an antenna of a communication device, and the communication device. The communication device comprises an adjustable antenna, a radio-frequency module, a microstrip line, a temperature sensor and a controller; the microstrip line is used for connecting the antenna to the radio-frequency module; the temperature sensoris arranged on the microstrip line; and the controller receives a temperature signal from the temperature sensor, and controls the working state of the antenna based on the received temperature signal.