To solve the production contamination problems occurring during the processing of cathode products in the titanium production by electrolysis(200 kg/d), a special titanium ball mill was designed and its technical parameters were studied. The results show that the titanium ball mill is designed as a cylinder and its size is 1 080.9 mm both for the diameter and height(about 320 L). The processing capacity of this equipment can reach 148.3 kg/h and its motor power needs 5 kW. When the condition of ball-milling speed, mass ratio of three sizes ball(small, medium and large), liquid-solid ratio, fill rate and ball-milling time are 35 r/min, 1∶1∶2, 4∶1, 50% and 25 min, respectively, the quality of the obtained titanium powder can meet the TF-2 grade level in YS/T 654—2007 and its particle sizes are close to the laboratory work. In short, the device designed for the post-processing can meet to the pilot scale production requirement.