Device for determining enantiomer excess value of compound by using capillary electrophoresis speed difference mode

The invention discloses a device for determining the enantiomer excess value of a compound by using a capillary electrophoresis speed difference mode. The device comprises a cathode liquor storage tank 1, an anode liquor storage tank 2 and a sample tank 5, wherein a negative electrode arranged on the cathode liquor storage tank is connected with a power supply through a lead; a positive electrode arranged in the anode liquor storage tank is connected with the power supply through a lead; one end of a capillary tube 4 which is arranged in a zero-pole liquid storage tank 3 in a penetrating manner is movably connected with the anode liquor storage tank 2 or the sample tank 5; the other end of the capillary tube 4 is movably connected with the cathode liquor storage tank 1 or the sample tank 5; the capillary tube arranged in the zero-pole liquid storage tank 3 is provided with a gap 6 which is conductive and free of mass transfer; a protective layer 8 is arranged on most of the outer surface of the capillary tube 4; and a detection window 7 is arranged at the part which is not provided with the protective layer. In measurement of the enantiomer excess value by using the device disclosed by the invention, the demands on the splitting capability of a resolving agent are reduced, the application range of an existing chiral resolving agent in measurement of the enantiomer excess value is expanded, and the development cost of the chiral resolving agent is reduced.