The invention belongs to the technical field of wood processing, and discloses a round bar molding machine which comprises a frame. A feeding mechanism, a milling mechanism and a discharging mechanism are arranged on the frame in sequence from back to front. The feeding mechanism comprises at least two feeding roller groups. In each feeding roller group, driving feeding rollers and driven feeding rollers are arranged in pairs. Right-angled V-shaped grooves are processed in the circumferential surfaces of all the feeding rollers. Small circular grooves are formed in the bottoms of the right-angled V-shaped grooves. The discharging mechanism comprises at least two discharging roller groups. In each discharging roller group, driving discharging rollers and driven discharging rollers are arranged in pairs. Large circular grooves are processed in the circumferential surfaces of all the discharging rollers. The milling mechanism comprises a main tool rest and a milling tool component arranged on the main tool test. The small circular grooves are formed in the bottoms of the right-angled V-shaped grooves of the feeding rollers, so that the radial positioning precision of bars is improved, and the off center problem caused in bar processing is solved.