Device for collecting carbon isotopes of aldehyde ketone compound discharged by plants

The invention relates to a device for collecting carbon isotopes of an aldehyde ketone compound discharged by plants. The device comprises a potassium iodide copper pipe, a first flow control valve, a gas inlet pump, a second flow control valve, a first flow meter, a DNPH purification pipe, a Teflon sampling bag, a silica gel sampling pipe, a second flow meter, a third flow control valve and a sampling pump which are sequentially connected by adopting silica gel air flow guide pipes, wherein the air inlet end of the Teflon sampling bag can sleeve plant branches and leaves into the bag; and the air outlet end of the Teflon sampling bag is connected with the silica gel sampling pipe through a self valve. According to the device, the sampling pump is used for exhausting environment air stored in the Teflon sampling bag before collection to form vacuum, so that the interferences caused by previous aldehyde ketone pollutants and other impurities in the sampling bag can be avoided; and the air pumped into the Teflon sampling bag from an air inlet pump is clean air filtered by the potassium iodide copper pipe and the DNPH purification pipe so that the influences caused by ozone and the aldehyde ketone pollutants in the environment air can be eliminated.