A sensitive method followed by capillary electrophoresis with on-line perconcentration and capacitively coupled contactless conductivity detection (CE–C4D) was evaluated as a novel approach for the determination of three sulfanilamide artificial sweeteners (acesulfame-K, sodium saccharin and sodium cyclamate) in beverages. The on-line preconcentration technique, namely field-amplified sample injection, coupled with CE–C4D were successfully developed and optimized. The separation was achieved within 10min under the following conditions: an uncoated fused-silica capillary (45cm×50μm i.d., Leff=40cm), 20mmolL−1 HAc as running buffer, separation voltage of −12kV, electrokinetic injection of −11kV×8s. The detection limits of acesulfame-K, sodium saccharin and sodium cyclamate were 4.4, 6.7 and 8.8μgL−1, respectively. The relative standard deviation varied in the range of 3.0–5.0%. Results of this study show a great potential method for the fast screening of these artificial sweeteners contents in commercial beverages.