Gas flux continuous measurement system and measurement method thereof

The invention relates to a gas flux continuous measurement system and a measurement method thereof. The gas flux continuous measurement system is characterized in that a gas flux measurement loop is formed from a gas outlet of a flux cover to a gas inlet of the flux cover through a first three-way electromagnetic valve, a collection gas pump, a gas sensor and a second three-way electromagnetic valve; a gas outlet of the flux cover passes through the first three-way electromagnetic valve, an adjustable flow meter and a vacuum pump to reach a system exhaust port to form a gas exhaust gas path; and an air cleaning air path is formed from a system air inlet to an air inlet of the flux cover through the one-way valve and the second three-way electromagnetic valve. And a main control circuit controls the communication direction of the electromagnetic valve and the start and stop of each pump, the exhaust gas circuit and the cleaning gas circuit work firstly, and then the measurement loop works. A continuous automat