The present invention relates to an ear-carrying heart beat detection device, which includes a device body, an attaching structure, an ear clip, an extension assembly, a control circuit and a wrist watch unit. The attaching structure is coupled to the device body. The ear clip includes a blood flowrate sensor to detect variation of blood flowrate through a users earlobe. The extension assembly adjusts the relative distance of the ear clip with respect to the device body. The control circuit is arranged inside the device body and the control circuit transmits a heart beat signal to a wrist watch unit in a wireless manner to allow the user to inspect the condition of heart beat of his or her body and to adjust the time period and style of exercise according to the heart beat information.
