Superfine coatings have been prepared by Electro-spark deposition (ESD) on die steel substrate with WC-8Co electrode. The microstructures and abrasion performance of the coating were investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and microhardness tester. The results show that ultra-fine particles prevail in the coating. The primary phases of the coating contain Fe3W3C, Co3W3C, Fe7W6 and W2C. The maximum microhardness reaches 1432.5 HV0.3. The results of abrasive test demonstrated that the coating had an excellent sliding wear resistance because the superfine particles distributed dispersedly in the coating increased the resistance to micro-cutting and plowing during the wear test, which effectively improves the surface performance of die steel substrate.