Abstract: The cold metal transition plus pulsed (CMT + P) double filament double arc process was used to add 60 layers of 316L stainless steel deposits, and the effects of different deposition currents on the microstructure and mechanical properties of the deposits were comparatively analysed. The results show that the forming height and width increase with the increase of the melting current, and the forming surface was good without obvious defects, which was a feasible dual-filament dual-arc additive manufacturing process. Metallographic analysis shows that the organisation consists of γ-Fe and δ-ferrites, and the bottom up was dominated by continuously growing columnar dendrites. When the current changes, there are obvious changes in the size and shape of the ferrite, and the ferrite was negatively correlated with the melting current; The mechanical property analysis shows that the overall performance was optimal when the melting current was 100 A. The average impact absorption work was 31.15 ± 0.85 J, the overall tensile strength reaches 521.9 ± 5.18 MPa, the overall yield strength reaches 214.45 ± 5.87 MPa, and the elongation at break reaches 47.6 ± 2.1 %, and the fracture was a toughness fracture; The highest average hardness of 209.1HV0.3 was achieved at a melting current of 83A, but the hardness was more uniform at a melting current of 100A.