The invention discloses a digital body-building 
system which comprises a video acquisition module, a motion state acquisition module, a vital sign acquisition module, a 
data processing module, an action standard judgment module, an action guidance advice output module, an action command recognition module, a 
central processing unit, a three-dimensional teaching module, a man-
machine operation module, a body-building result statistics module, a 
physical model building module, a virtual 
actuator, a virtual sensor and a 
simulation analysis module. The digital body-building 
system disclosed by the invention realizes automatic determination and guidance of body-building actions; by using the delivery function of a three-dimensional teaching video of the 
system, the repeated playback and learning of the teaching video or a guidance video can be performed, so that repeated viewing and understanding of body builders for each action are greatly facilitated, the body-building efficiency is improved, the actions are more standard, and the 
workload of teachers is also reduced; meanwhile, the comprehensive analysis on 
human body situations and the targeted body-building 
program planning can also be realized in a manner of combining a 
physical model and simulated analysis according to the situations of each body builder.