The invention relates to the field of respiratory protection articles and respiratory monitoring, discloses a high-synchronization oxygen supply respiratory device, a respiratory monitoring system andmethod, and solves the problems of low comfort and single function of a traditional mask. The breathing device comprises a mask body, a power module arranged on the mask body, a control panel, a draught fan, an alarm module and a throttling device, wherein the control panel, the draught fan, the alarm module and the throttling device are electrically connected with the power module. A microcontroller, a data storage module, a data communication module and a draught fan driving module are arranged on the control panel; the throttling device comprises a throttling element, a pressure sensor anda differential pressure sensor, wherein the pressure sensor and the differential pressure sensor are arranged on the throttling element. The signal input end of the draught fan driving module is connected with the microcontroller, and the signal output end of the draught fan driving module is connected with the draught fan; signal output ends of the pressure sensor and the differential pressure sensor are connected with the microcontroller; and the microcontroller is also connected with the data storage module, the data communication module and the alarm module. The breathing device is suitable for various people.