The invention provides a method for evaluating the water-resisting property indexes of a Middle Ordovician limestone ancient weathering crust. According to the technical scheme, the method is characterized by including the following steps that firstly, it is determined that water-resisting property indexes are depicted; secondly, thematic maps of the water-resisting property indexes are established; thirdly, weight coefficients of the indexes are determined based on the information fusion technology; fourthly, the thematic maps of the water-resisting property indexes are overlapped; fifthly, a water-resisting property evaluation model is established; sixthly, the water-resisting property is divided and evaluated. A mine lot is divided into five sub lots, a weak water-resisting property lot, a weaker water-resisting property lot, a transition water-resisting property lot, a stronger water-resisting property lot and a strong water-resisting property lot. The method for evaluating the water-resisting property indexes of the Middle Ordovician limestone ancient weathering crust is provided for the first time, and the water inrush evaluation and prediction defects that in the mining practice, the water inrush phenomenon never occurs on many water inrush points with the values far larger than a critical value in the seam floor water inrush evaluation process are overcome.