Abstract: Titanium carbide MXene-gold nanocomposite (AuNPs@Ti₃C₂ MXene) is prepared by in-situ reduction method, and used for developing a high sensitive electrochemical sensor of Sunset Yellow. The electrochemical behavior of the modified electrode and Sunset Yellow is studied. The analysis results show that the square wave voltammetric peak current of Sunset Yellow displays a good linear relationship in the concentration range of 0.01~100 μmol/L with the detection limit of 2.4 nmol/L under the optimal conditions, implying that the synergistic effect of the unique accordion structure of MXene and the excellent electrical conductivity of gold nanoparticles can significantly improve the electrochemical response of Sunset Yellow. The preparation method of the sensor issimple, and has been successfully applied to the analysis of beverage samples with high degree of accuracy.