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With the rapid development of the radar technology, digital phased array antennas have been widely used in various kinds of phased array radar. Due to the great difference of the principle between digital phased array antenna and conventional analog phased array antenna as well as the fundamental change of test method, original antenna test system based on common microwave instrument can no longer test digital phased array antenna and a new type of digital phased array antenna test system design is needed. This paper firstly introduces the working principle and test method of digital phased array antenna, and then proposes the concrete hardware and software design of new digital phased array antenna test system. The practical application shows that the digital phased array antenna test system can meet a variety of test requirements of digital array antenna.