Disclosed is a hot continuous rolling production line of titanium and titanium alloy bars. According to the hot continuous rolling production line of the titanium and titanium alloy bars, a longitudinal rolling production line of the titanium and titanium alloy bars is composed of a heating furnace, a transverse type two-roller roughing rolling unit, a high-rigidity short-stress-line longitudinal type two-roller moderate rolling unit, a high-rigidity short-stress-line longitudinal type two-roller pre-finishing rolling unit and a small bar cooling table, a low-speed continuous rolling technology is adopted, heat caused by resistance to deformation in a rolling process is reduced, the interior structure and performance of a rolled piece are guaranteed, and qualified bars can be produced directly. According to the hot continuous rolling production line of the titanium and titanium alloy bars, all specifications of titanium and titanium alloy bars with diameters between 12 mm and 140 mm can be rolled, high-precision and large-piece-weight titanium and titanium alloy bar production can be achieved, production efficiency is high, and production cost is low.