An upstream type intelligent small-sized tobacco leaves concentrating and flue-curing house of the utility model is provided with an air inlet inside the house, a clerestory and an air-return hole on the top, a hearth, a main fire tube, a branch fire tube, a chimney, a fire brake, a hot-air duct and an air outlet on the ground, wherein the main fire tube is connected to the combustion chamber of the hearth, the multi-path of the branch fire tube is in circuitous distribution, the air-return duct of the lower side of the fire tube is distributed same as the fire tube, the hot-air chamber is provided with an isolation board; a fan is arranged in the upper side of the branch hot-air duct and is connected to the air inlet to form a hot-air recycle system, a temperature and humidity control device, a dry-bulb temperature sensor, a wet-bulb temperature sensor, a fan, a blower, and an air door are connected to form an intelligent control device. The flue-curing house is internally provided with even temperature and humidity, accurate adjusting and controlling, increases tobacco leaves capacity, lowers energy consumption, saves the baking cost by 20 %, and improves the tobacco leaves quality. The average sale price per unit is raised by 80 Yuan, thereby increasing tobacco farmers' incomes.