To solve the problems of daily barbecue furnaces in the barbecue process, such as severe environmental pollution, great heat loss and inconvenient cleaning and carrying, the author designs a kind of portable barbecue furnace taking outdoor flat gas tank as heat source and combining infrared flameless burner with rotary barbecue grill. This paper introduces the structure and operation principles of the barbecue furnace, and uses FLUENT software to conduct a simulated analysis of the temperature field in the barbecue furnace. The results showed that the barbecue furnace has the reasonable temperature distribution in the overall structure; uniform air flow; the good heat preservation effect, and the grill high-quality food to meets the users’ requirements.