The invention provides an igneous rock open-fracture earthquake prediction method. The method comprises steps of step 1, through analysis of the FMI imaging logging, counting density of open fractures of a depth segment; step 2, carrying out refined synthesis earthquake recording calibration; step 3, by analyzing response features of the fractures on the earthquake recording, using post-stack earthquake data to extract earthquake attribute bodies; step 4, establishing a corresponding relation between the density of the open fractures and the earthquake attributes and using well point data to calibrate the earthquake attributes; step 5, by using the corresponding relation on well points, calculating distribution of density of the open fractures in a non-well control region, and establishing a fracture skeleton module; and step 6, carrying out open fracture density calibration on a new well and carrying out verification and correction on the prediction precision. According to the invention, the information included by the post-stack earthquake data can be fully used for analyzing earthquake response caused by open fracture development zones, and precisely predicting the open fracture development zones.