The invention relates to the technical field of the 
isotope labeling and in particular to a circular 
system for a cultivating abundant 
isotope carbon and 
nitrogen double-labeling 
plant sample. The circular 
system for the cultivating abundant 
isotope carbon and 
nitrogen double-labeling 
plant sample comprises a sealed cultivation chamber, a CO2 
injector, a gas balancing device, a 
nutrient solution 
injector and a 
nutrient solution circular 
system. The sealed cultivation chamber comprises a transparent cover and a base. The transparent cover is internally provided with a 
semiconductor condensation dehumidification device. The transparent cover is connected with the CO2 
injector and the gas balancing device. A cultivation basin, a 
liquid storage chamber, an external 
peristaltic pump, an 
ultraviolet sterilizing device, a circular 
peristaltic pump and a converging 
pool are successively connected to form a 
circular loop of the 
nutrient solution circular system. The converging 
pool is connected with the 
semiconductor condensation dehumidification device and the 
nutrient solution injector. The cultivation basin and the 
liquid storage chamber are installed in the base. The top of the cultivation basin is communicated with the transparent cover. Silica sand is installed in the cultivation basin. The circular system for the cultivating abundant isotope carbon and 
nitrogen double-labeling 
plant sample is capable of simultaneously labeling the carbon and nitrogen isotope, and realizing the cyclic utilization. The 
pollution of normal 12 C and 14 N is avoided, and an abundant carbon and nitrogen isotope double-labeling plant can be obtained.