Multi-component exhaled gas detection device and detection method thereof

The invention discloses a multi-component exhaled gas detection device which comprises an exhaled gas collection unit, a gas concentration detection unit, a gas chamber unit and a control unit, the air chamber unit comprises an air chamber cavity, a pressure sensor and an air suction and exhaust module; the exhaled air collecting unit is communicated with the air chamber cavity; the gas concentration detection unit is mounted in the gas chamber cavity and is used for detecting the concentrations of different gas components in the gas chamber cavity; the pressure sensor is arranged in the gas chamber cavity and is used for detecting the gas pressure in the gas chamber cavity; the air suction and exhaust module is used for air suction and exhaust of waste gas and waste liquid; the control unit is respectively connected with the pressure sensor and the exhaust module, and is used for adjusting the action of the exhaust module according to a pressure signal detected by the pressure sensor, so that the pressure in