The future development of pig breeding is to carry out intelligent breeding models, which is based on the dynamic collection of the scale information of the pig breeding industry chain. The intelligent control of pig breeding process, which is the central link of pig industrial chain, is the short board that urgently needs to be strengthened in the transformation and upgrading of pig breeding in China. Pig behaviors are the most informative carrier in the breeding process, and it is an important evaluation basis for the sports function, health state and mental state of pigs. In this review, the detailed classification of pig behaviors are comprehensively sorts out. The effects on pig behaviors from heredity, nutritional status, dietary composition, breeding environment, breeding management and pig’s health status were analyzed. The pig behaviors monitoring methods based on sensors, machine vision and sound are summarized. The challenge of pig behaviors monitoring technology development is also pointed out. The monitoring of pig behavior provides another powerful data grasp for intelligent pig breeding, which can be used to real-time monitor the health and welfare status of pigs in the breeding process and will promote the development of pig breeding process intelligent control.