Arm-wearable heart rate detection belt

The utility model discloses an arm-wearable heart rate detection belt. The arm-wearable heart rate detection belt comprises a body, a belt body, a power supply device, a heart rate detection device, a rotary speed detection device and a light signal transmission device, wherein the two ends of the belt body are connected to the two sides of the body, the power supply device is arranged on the body, and the heart rate detection device is arranged on the body, electrically connected to the power supply device and used for detecting the heart rate of a user and outputting heart rate signals. The arm-wearable heart rate detection belt is used for detecting the heart rate and the rotary speed of a rotary sports instrument when the users uses the rotary sports instrument and transmits the heart rate and the rotary speed to a displayer of a portable electronic device in a wireless mode so that the user can know the heart rate and the rotary speed. In addition, the problem that a user can not know whether the cardio-pulmonary function is improved or not through an existing heart rate display device is solved.