The invention discloses a pig behavior rhythm analysis method, which comprises the steps of S1, installing a monitoring camera at the pig production field, and marking pigs so as to differentiate the pigs; S2, acquiring monitoring video of the pig production field in real time, positioning individual pigs, and determining the movement distance of the pigs; S3, judging pig behaviors according to the movement distance of the pigs in unit time; S4, and building a pig behavior rhythm model by combining behavior data of pig individual growth cycle and behavior data between groups. The pig behavior rhythm analysis method is simple in structure, convenient, easy to use, and suitable for being deployed and applied in a large scale to the breeding industry.