The present invention provides a device and method for forming a ceramic-reinforced metal matrix composite (MMC) by follow-up ultrasonic-assisted direct laser deposition (DLD), and belongs to the technical field of additive manufacturing (AM). A positioning and clamping device is used to keep an ultrasonic impact gun to follow a coaxial powder feeding nozzle. During the DLD process of the ceramic-reinforced MMC, the cavitation, acoustic flow and mechanical and thermal effects of an ultrasound are used to intervene in a solidification behavior of a molten pool in real time, and a localized strengthening effect of an ultrasonic impact is used to adjust a stress in real time. Compared with a DLD forming method without follow-up ultrasound application, the method of the present invention effectively reduces the voids inside a workpiece, and ensures the consistency of a solidified structure and the evenness of stress distribution.
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