The invention relates to a digital array real-time calibration device and method and belongs to the technical field of radar. The device comprises a digital array antenna, a calibration assembly, a transmitting and receiving assembly, a coupling calibration feed network, and a data processing assembly. The data processing assembly controls the calibration assembly to generate a receiving calibration signal. Through utilization of the coupling calibration feed network, the digital array antenna and the transmitting and receiving assembly, receiving calibration data is obtained based on the receiving calibration signal. The data processing assembly controls the transmitting and receiving assembly to generate a transmitting calibration signal. Through utilization of the digital array antenna,the coupling calibration feed network and the calibration assembly, a transmitting calibration coupling signal is obtained based on the transmitting calibration signal. The data processing assembly computes transmitting and receiving channel calibration compensation data of a digital array according to the receiving calibration data and the transmitting calibration data. According to the device and the method, an automatic reliable scheme for channel calibration of equipment is provided, the inconsistency resulting from design and manufacture batch difference, equipment temperature drift, performance aging and the like is solved, and the device and the method are adaptive to replacement of the equipment and change of an environment.