The embodiments of the present invention provide an array antenna beam adjustment device; before combining and analog-digital conversion, the array antenna beam adjustment device couples an N-way reception signal, and performs low-speed small-bandwidth analog-digital conversion on the N-way reception signal; according to the analog-digital converted signal, spatial filtering is performed and a filtering coefficient is adjusted; according to the filtering coefficient, the weight of the reception signal is adjusted, and thus the reception beam is adjusted. In the embodiments of the present invention, beam control is carried out according to the N-way reception signal, and the speed and flexibility of the beam control are greatly improved.