Plant root exudate collecting device

The utility model discloses a plant root exudate collecting device which comprises a hydroponic box with an opening in the upper end, a hydroponic plate is erected at the upper end of the hydroponic box, a plurality of cultivation holes are formed in the hydroponic plate in a penetrating mode, the bottom of the hydroponic box is downwards communicated with a drainage pipe, and the middle section of the drainage pipe is connected with a micro hydroelectric generation device. The free end of the drainage tube is communicated with a shunt tube, the shunt tube is downwards communicated with a plurality of enrichment tubes, and a resin enrichment column is arranged in each enrichment tube; a liquid collecting tank connected with the water culture tank is arranged at the lower end of the enrichment pipe, a water pump is arranged in the liquid collecting tank, and the outlet end of the water pump is communicated with a circulating pipe extending to be communicated with the upper end of the water culture tank; a sola