The invention discloses a numerical value simulation method and system of an elastic wave field. The method can comprise the steps of 1, building a speed model, determining sampling intervals of spaceand time, and performing finite differential mesh discretization; 2, calculating internal wave field data according to an elastic fluctuation equation; 3, calculating angle point wave field data according to an angle point wave field numerical value calculation formula; 4, calculating boundary wave field data according to a wave field absorption boundary equation and a wave field absorption coefficient; 5, acquiring wave field data of the speed model, judging whether a reflection condition of the wave field boundary conforms to a preset standard or not, if yes, executing the step 6, if not, determining a wave field absorption coefficient again, and repeating steps 4 and 5; and 6, outputting final wave field data. The propagation authenticity of an elastic wave in a two-dimensional isotropic medium can be accurately reflected by a model wave field value, and the purpose of improving elastic wave numerical value simulation result accuracy is improved.