The utility model discloses a water collection device for a naturally-ventilated reverse flow cooling tower. The water collection device comprises a front water collection assembly, a rear water collection assembly, a left water collection assembly and a right water collection assembly, wherein water collection boards in all the water collection assemblies are all obliquely arranged at the periphery of a rain region. According to the water collection device, the airflow resistance of the rain region is reduced, the ventilation quantity of the cooling tower increases, the supply air rate of the central rain region can be improved, the operation efficiency of the cooling tower is finally improved, the temperature of water flowing out of the cooling tower can be lowered by 0.5-1.5 DEG C (wherein the temperature drop is small in summer and is big in winter), and the efficiency of a turbine in a power station is improved; taking a 1000MW set as an example, after the set runs for 5500 hours per year under a situation that the coal consumption does not increase, about 8250000 kilowatt hours of electricity can be additionally generated, and remarkable benefits can be gained each year, so that the water collection device has obvious economic value and significance.