Abstract: Steady-state magnetic fields, ultrasonic vibration, and liquid nitrogen forced cooling are three auxiliary technologies widely applied in laser cladding. Auxiliary technologies can reduce defects in the cladding layer and enhance its mechanical properties. Steady-state magnetic fields cannot completely eliminate pores, suppressing pore formation by enhancing the fluid’s viscosity effect. Ultrasonic vibration can reduce the temperature gradient in the melt pool and decrease the size of grains through the effects of acoustic streaming and cavitation. Ultrasonic vibration can enhance the mechanical and tribological properties of the cladding layer. Liquid nitrogen forced cooling accelerates the cooling process, thereby reducing residual stress, which leads to an increase in the hardness and wear resistance of the cladding layer. The significance of auxiliary technologies in addressing the challenges in traditional laser cladding processes. Auxiliary technologies not only advance laser cladding technology but also provide high-performance materials for the field of materials science.