The invention discloses a coal mining ground collapse damage degree prediction method for a terrain flat region covered with an unconsolidated layer. The method aims at predicting the ground collapsedamage degree caused by coal mining. The method comprises the steps of firstly, selecting a ground collapse damage degree prediction index, and obtaining basic information; secondly, according to a given ground collapse prediction table, predicting the ground collapse condition of the working face of the region to be mined, and achieving accurate and reliable quantification on the coal mining ground collapse damage degree of the region to be mined; finally, according to the prediction result, evaluating the ground collapse damage degree. The method has the advantages of being quantified, visualized and simple, and has the reality guiding effect on ecologic environment repairing of the coal mining region.