Scientific and reasonable disaster indexes are the basis and key to the effective disaster early warning and accurate disaster impact assessment. In this study, based on the principle of wind damage to agricultural facilities, the wind disaster indexes of protected agricultureare divided into two levels. Level Ⅰ is for the damage to the main structure of the facility, Level Ⅱ is for the damage to the shed film. Based on the local climate characteristics and design service lifetime of solar greenhouses and plastic tunnels, the extreme value probability distribution model is used to analyze the maximum wind speed observation data of 2467 weather stations from 1989 to 2018, and the maximum wind speed of 20-year and 10-year return period are calculated. On this basis, the wind resistance of different types of agricultural facilities and the disaster-causing factors are considered comprehensively, and the wind disaster indexes for solar greenhouses and plastic tunnels of different levels based on extreme wind speed are established. According to the main distribution areas of solar greenhouses and plastic tunnels in China, the wind disaster indexes distribution maps are drawn. Based on the 2009-2018 wind disaster data of protected agriculture and the wind disaster cases of representative provinces in each region in 2020, the wind disaster indexes determined in this study are in good agreement with the disaster-bearing body’s degree of damage and the observed wind speed. And the method for determining the wind disaster index is feasible.