Abstract: Objective Laser arc composite additive can improve the microstructure and mechanical properties of the additive component, which has a certain application prospect. Using it in manufacturing nickel-based high-temperature alloy can be expected to obtain the component with better properties, and meet the increasing application requirement of nickel-based high-temperature alloy. Methods In this paper, a pulsed laser is applied in the process of arc additive Inconel 718 nickel-based high-temperature alloy, and the effect of laser assisted on microstructure and properties of arc additive Inconel 718 nickel-based high-temperature alloy is analyzed. Results The results show that the addition of the pulsed laser can break the columnar crystal, leading to grain refinement and improve the ultimate tensile strength of the component. The effect of pulsed laser on vertical samples is greater than that on horizontal samples. When the laser pulse frequency is 50 Hz, the component has the best mechanical property. The addition of pulsed laser increases the formation probability of pores and other defects, and the higher the pulse frequency, the more defects, the existence of defects limits the improvement of tensile properties. Conclusion This study establishes a theoretical foundation for the microstructure and property adjustment of arc additive nickel-based high-temperature alloy by laser assistance, and provides a preliminary exploration for the application of laser arc composite additive in the field of nickel-based alloy manufacturing.