The invention discloses a CATIA-based stability analysis model compilation method for an arch dam abutment. The method comprises: step one, collecting topographic and geological data of a dam site; step two, calculating a plane position and an inclination angle of a ridge according to the collected data; step three, establishing a topographic and geological model by using CATIA three-dimensional modeling software; step four, establishing dam head rock mass units; step five, designating different-elevation dam head rock mass units for cutting; step six, cutting the dam head rock mass units into sliding blocks; and step seven, reading dead weights and areas of lateral sliding areas and bottom sliding areas of the sliding blocks by using CATIA. According to the method disclosed by the invention, on the basis of rapid extraction of computing data of the areas of lateral sliding areas and bottom sliding areas and the volumes of sliding blocks, correctness of a checking sliding ridge computing value is guaranteed and stability of the arc dam abutment analysis is improved.