Photothermal conversion nanomaterials attract much attention for their high light/heat transform efficiency and controllable light absorption. In this work, the CuS semiconductor nanomaterials were prepared through the deposition method in the presence of citrate sodium and were characterized by TEM, XRD and UV-vis spectra. A new type of nano composite coating was obtained from acrylic resin by adding the CuS nanoparticles and other nanomaterials which could absorb the light of various infrared bands. The test showed that when exposed to infrared light, the plastic greenhouse model equipped with photothermal conversion coating gave out a more significant temperature rising than that of the common plastic greenhouse. The properties of photothermal conversion and heat insulation of photothermal conversion coating reach the best when the addition quantities of CuS and ZrC nanoparticles are 2%.