The invention provides a calcium soil grain breakage evaluation method. The calcium soil grain breakage evaluation method incudes: firstly, preparing a dry soil sample; secondly, performing compression test according to soil testing regulations; thirdly, organizing and computing according to data acquired in the second step; fourthly, evaluating grain breakage according to a compression index Cc, or establishing a linear relation with Br to evaluate grain breakage situation of calcium soil under normal pressure, and furtherly analyzing and evaluating a breakage degree of the calcium soil. The calcium soil grain breakage evaluation method is less in testing steps, simple and convenient to implement, the index which is clear and definite is easy to obtain and applicable to conversion, and the calcium soil grain breakage evaluation method is precise in result and wide in application.