The present invention discloses a livestock tracing system and method. The system includes: a feeding module, an adopting and purchasing module, a weighing module, a server, a first commutation module and a second communication module； the feeding module is configured to provide food intake information of livestock and transmit the food intake information to the server via the first communication module； the weighing module is configured to provide weight information of the livestock and transmit the weight information to the server via the second communication module； the adopting and purchasing module is configured to provide vaccine information of the livestock and transmit the vaccine information to the server； and the server is configured to store the food intake information, the weight information and the vaccine information, and obtain corresponding tracing information according to a tracing look-up instruction.
