The invention discloses a multi-antenna device control method and module. The multi-antenna device control method comprises the following steps: a wireless transmission device transmits a wireless packet to the multiple antennas of the multi-antenna device; the efficiency optimization unit of the multi-antenna device selects one of the antennas of the multiple antennas successively to connect the wireless chip of the multi-antenna device; the efficiency optimization unit selects the antenna corresponding to the maximum of the received data rate as the designated receiving antenna, and selects another antenna corresponding to the secondary large value of the received data rate as a standby antenna; the efficiency optimization unit receives wireless packets with the designated receiving antenna in a transmission cycle; and at least one test interval is inserted during the transmission period, and the standby antenna is used instead of the designated receiving antenna to receive the wireless packets during the test interval. By means of the multi-antenna device control method, the received data rate of the wireless packets can be improved with a low cost and the multi-antenna device under the condition that the complicated specifications such as wireless communication standards and communication protocols are satisfied.