In-situ collecting device for root exudates of hygrophytes and collecting method of in-situ collecting device

The invention discloses a hygrophyte root exudate in-situ collection device and a collection method thereof.The collection device comprises a collection box with an opening in the top and a collection cover matched with the collection box, and the collection cover is detachably connected with the collection box in a sealed mode; the collecting box is filled with a root culture medium for culturing plants; the collecting box is provided with a first channel through which a plant root system passes; the inner bottom surface of the collecting box is an inclined surface, and the inner bottom surface of the head end of the collecting box is higher than the inner bottom surface of the tail end of the collecting box; a sample feeding needle tube and a sample discharging needle tube are arranged on the collecting cover in a sealing manner; a mounting groove and a tenon are respectively arranged on the collecting box and the collecting cover, so that the collecting cover can be opened or closed in a drawing manner, a