In order to study the lacquering techniques used for the coffin excavated from the Xinzhuang No.1 Chu tomb of the Warring States Period in Pingdingshan, Henan Province, and to provide a corresponding scientific basis for conservation and restoration, several methods, including 3D video microscopy, scanning electron microscopy-energy dispersive spectrometry (SEM-EDS), Fourier transform infrared (FTIR) spectrometry, and Raman spectrometry, were used to analyze the cross-section and composition of lacquer film of the intermediate and the inner coffin, which was preserved in good conditions. The results reveal that the lacquer film of the inner coffin was mainly divided into four layers (the wood layer, the lacquer layer, the pigmented surface layer, and the painted layer), and that of the intermediate coffin was mainly divided into three layers (the wood layer, the lacquer layer, and the red pastels surface layer). There was no ash layer in the lacquer film of the coffin. The main component of lacquer film was raw lacquer, and that inside the inner coffin was raw lacquer and tung oil. The pigment of the red film was cinnabar, the yellow pastel was pararealgar, and the black layer was raw lacquer. The results of this study could provide reference for the restoration of lacquered wooden coffins of the Warring States Period.