Tungsten disulfide (WS 2 ) has a graphite-like structure with the properties of strippable and indirect/direct band gap conversion, which makes it have important applications in the fields of optoelectronics, catalysis and lubrication. Here, ultra-thin WS 2 nanosheets with texture on the surface were obtained by colloid synthesis method, and its phase, morphology and valence state were characterized. TEM images displayed that the obtained sample had flower-like morphology composed of "petal" nanosheets with several stripes on the surface. Interestingly, the fabricated WS 2 nanosheets exhibited excellent catalytic performance for the conversion of benzylamine with the yield reaching 97.9 % and excellent catalytic activity still being retained after 5 cycles of catalysis, and the WS 2 nanosheets also had good catalytic activity for coupling reactions of benzylamine homologues to synthesize corresponding imines. Besides, the coupling reaction could be done in natural light without the need for additional light and oxygen atmosphere at certain temperature. Further research showed that in our reaction system, the benzylamine oxidative coupling reaction was a photothermal co-catalytic process with thermal catalysis being dominant role and photocatalysis further improving the yield.