The invention discloses a mobile communication device with a body fat detection module. The body fat detection module is arranged in the mobile communication device, a user can detect or monitor a body fat signal which displays the fat degree of a human body through the mobile communication device at any time, display, record, store, list, alarm the body fat signal obtained by detecting or monitoring or transmit the body fat signal for remote receiving through the mobile communication device, and can be matched with a built-in database in the mobile communication device to provide a user with various application information of diet and sport to ensure that the user, besides detecting or monitoring the body fat signal, can improve and maintain the physique and weight of the body by being matched with the diet application information, exercise heat consumption reference values and body energy maintenance information. In the invention, the body fat detection module is arranged on various mobile communication devices to improve the additional value of the mobile communication devices; and the mobile communication device with the body fat detection module can ensure that the user detect or monitor the self body fat condition at any time to make the health condition known and improved at any time.