The invention relates to a device for transmitting a CMMB signal by a Bluetooth module and a control method thereof. The device comprises an antenna for receiving a CMMB analog radio frequency signal, a tuner for converting the CMMB analog radio frequency signal into intermediate frequency signal, a demodulator for demodulating the intermediate frequency signal output from the tuner, a processor for performing a control program and adjusting and updating data output from the demodulator, the Bluetooth module for sending the CMMB signal processed by the processor to an intelligent terminal, and a power supply control module for supplying operational power supply to the tuner, the demodulator, the processor and the Bluetooth module. The control method comprises the following steps: CMMB data is received; integrity dynamic check and de-multiplexing are carried out on the CMMB data; the checked and de-multiplexed data is adjusted, updated and reprocessed; and the reprocessed data is sent to the Bluetooth module. The device has wide application fields, high performance-cost ratio and low cost, and terminal users can watch CMMB TV programs by arranging the device without replacing the existing intelligent equipment.