The invention discloses a semi-automatic auxiliary laser processing device which is composed of a machine frame, an ultrasonic vibration auxiliary device, an auxiliary air blowing device and a controller. The ultrasonic vibration auxiliary device can achieve multi-degree-of-freedom vibration of workpieces, defects such as a recasting layer, oxide and microcracks existing in the laser processing process can be greatly reduced, and workpiece processing efficiency can be improved. The auxiliary air blowing device adopts coaxial and paraxial air blowing, melt flashing during processing can be reduced, and workpiece processing quality is improved. The semi-automatic auxiliary laser processing device has the advantages of being reliable to work, high in automation degree, multifunctional, convenient and fast to maintain, high in processing efficiency, high in workpiece processing quality, high in applicability and the like.