Based on the pressure-controlled solid-state friction extrusion additive equipment, AA7075-T6 additive friction stir deposition (AFSD) process tests were carried out to explore the effect of transversal speed on the microstructure and mechanical properties of the deposited layer. The study shows that well formed and defect-free AA7075-T6 deposition specimens were successfully obtained under the process parameters of spindle rotational speed of 300 r/min and transversal speed of 100 mm/min and 150 mm/min, respectively. The deposited area is a completely dense and fine isometric crystal microstructure, and its average grain size is 4.32±1.50 μm, which is significantly refined compared with that of the original feed rods of 36.3±1.99 μm. Due to the strong thermal-force coupling friction and extrusion, the recrystallization ratio of the deposited area is more than 80%, and the hardness and tensile properties of the deposited layers are not uniformly distributed. With the increase of transversal speed from 100 mm/min to 150 mm/min, the hardness of the top of the deposited layers increases from 120 HV to 141 HV, which is 69.8% and 82.1% of the feed rods, respectively; the corresponding tensile strength increases from 416.5 MPa to 477.5 MPa, and the average elongation rises from 6.25% to 9.25%; however, the bottom tensile strength of the deposited layers increased from 397 MPa to 414 MPa, and the average elongation increased from 11.5 % to 12.25 %. The highest tensile strength and elongation of the deposited layers can reach 78.1 % and 80.6 % of the feed rods, respectively, and the fracture modes of the deposited specimens are characterized by ductile fracture. This indicates that the increase of transversal speed is favorable to the improvement of strength and plasticity in the AFSD deposited layers.