The embodiment of the invention discloses a mammary gland monitoring and early warning system based on NFC and a monitoring method thereof. The system comprises an intelligent bra, a server and a terminal application, wherein a plurality of sensors and a communication module are embedded in the intelligent bra, the sensors are used for monitoring mammary gland data of a user, and the communicationmodule is used for transmitting the mammary gland data to the terminal application in an NFC mode; the terminal application is used for receiving the mammary gland data monitored by the intelligent bra and sending the mammary gland data to the server; the server is used for processing the mammary gland data through a preset mammary gland monitoring algorithm to obtain mammary gland health conditions, and the mammary gland health conditions are fed back when the terminal application requests. The NFC connection is performed only when the user needs to check the current monitoring result, the communication speed between the intelligent bra and the terminal application is increased, and invalid connection between the intelligent bra and a terminal is avoided. In addition, the sensors are embedded in the underwear, so that daily wearing of the user is not affected, and use is very convenient.