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To establish the meteorological index for farming activities of wheat, the precipitation and soil moisture indexes for the main mechanized farming activities in Anhui Huaibei Plain are designed though qualitative and quantitative statistical analysis, based on the historical data of farming activities and contemporaneous precipitation and soil moisture data of many years. The results show that in wheat fields, the suitable soil moisture indexes for soil preparation (fertilization), sowing, and harvesting are 578% to 870%, 643% to 899%, and ≤467%, respectively. When the soil moisture index is between 50% and 55%, after a rainfall process, the suitable precipitation indexes for soil preparation (fertilization), sowing and harvesting are 10 to 25 mm, 20 to 25 mm, and ≤3 mm, as well as 3 to 20 mm, 5 to 25 mm, and ≤3 mm, respectively. When the soil moisture is 70%, the precipitation indexes for soil preparation and sowing are 3 to 5 mm and 3 to 10 mm. However, when the soil moisture is 70% to 80%, no matter how much the precipitation is, it is not suitable for harvesting, sowing, and soil preparation.