An embodiment of the invention provides a jointed rock blast vibration attenuation parameter predicting method and device and belongs to the field of blast technology. The method includes acquiring basic quality indexes and joint angle characteristics of multiple groups of different rock masses; acquiring attenuation parameters corresponding to the basic quality indexes and joint angle characteristics of the each group of rock masses; based on a preset algorithm, performing regression analysis on the attenuation coefficient and the damped exponential and acquiring a predication formula corresponding to the attenuation parameters. Therefore, uncertainty of attenuation parameter selection can be made up through the predication formula corresponding to the generated attenuation parameters, sothat the attenuation parameters can be selected in advance when blasting is performed by a user. Further, great convenience is provided for the user.