The plasma spraying Fe-based WC coating is treated by conventional laser remelting and laser remelting with addition of nano SiC. The surface morphology and cross-section morphology are observed by scanning electron microscopy, and the distribution of the elements at the interface of three coating are analyzed by energy dispersive spectroscopy. The phase composition of the coatings are analyzed by X-ray diffractometer, the surface residual stress is calculated and the microhardness in different depths of the coatings is measured. The results show that pores, cracks, and other micro-defects in plasma spraying coating are improved under the action of laser melting and nano SiC, the content of CrSi2, Cr7C3, and other hard alloy phase increase, and new phases such as Fe2Si and CrSi generate. The surface residual stress reduces from 363.4 MPa to 158.6 MPa, and the microhardness increases from 631 HV to 1195 HV.