A two-dimensional model and the user defined function of phase change were applied to simulate the liquid film heat transfer characteristic under counter-current airflow. The CLSVOF (a coupled Level-Set and Volume of Fluid) method was used to trace the gas-liquid interface. The local heat transfer coefficient and temperature distribution of the liquid film were discussed in detail. The specified parameters of the simulated model are as follows: the tube diameter is 25.4 mm, the Reynolds number of falling film is 187, 218 and 395, respectively. The range of counter-current air flow velocity is from 0 m/s to 1 m/s. The partial pressure of water vapor in moist air is 1200 pa. The inlet temperature of water is 27 °C, 40 °C and 50 °C, respectively, and the heat flux of tube wall is 7.5 kW/m². The results indicate that the ability of the falling film to carry away heat and absorb heat increases with the spraying Reynolds number. The maximum heat transfer coefficient is obtained at a circumferential angle of 15°, and the heat transfer coefficients at these three Reynolds numbers are 5.87 kw/(m²K), 5.63 kw/(m²K), and 5.27 kw/(m²K), respectively. When the inlet temperature of water increases from 27 °C to 40 °C, the heat transfer coefficient increases more. While when the inlet temperature of water increases from 40 °C to 50 °C, the heat transfer coefficient changes very little, and the heat transfer coefficient even decreases in the wake region. The effect of airflow on heat transfer occurs mainly in the impingement zone of the falling film and in the region after 90° from the circumferential angle. The local heat transfer increases with the increasing of the airflow velocity. However, the difference of the local heat transfer coefficient is not significant, as the air velocity is relatively small.