In order to solving the problem of feeding machine barrel steam heating, the material liquid temperature control precision and anxious burnt phenomenon, using hot water instead of steam of the material liquid to increase temperature compensation control, the barrel structure is improved, heat exchange area is increased, and the liquid temperature rise time has been shorten. The results show that: the liquid temperature has been controlled in the range from 40 to 50 ℃(control accuracy ±2 ℃), and the liquid to be heated up to the set temperature reduces the time that is spent more than 30%.