The invention discloses a tool provided with a high-smoothness coating and a manufacturing method thereof. The high-smoothness coating is formed through arc ion plating, the surface droplet density ofthe coating is smaller than 5*105/mm <2>, and the coating contains a metal element represented by Ti1-x-yCrxMoy (wherein, according to atomic ratio, x and y meets the relations of 0<=x<=0.1 and 0<=y<=0.1) and a non-metallic element represented by BalphaCbetaOgammaN1-alpha-beta-gamma (wherein according to atomic ratio, alpha, beta and gamma meet the relations of 0.1<=alpha<=0.6, 0<=beta<=0.2, and0<=gamma<=0.2). The coating has equiaxial ultrafine grain texture which is of a multi-layer structure composed of a plurality of layers with different boron contents. On an XRD spectrum of the coating, a cubic structure phase diffraction peak and a hexagonal structure phase diffraction peak can be detected at the same time. The coating has the characteristics of high smoothness, high hardness, high tenacity, high abrasion resistance, good lubricating performance and the like, and based on the special aluminum adhesion resistance of boride of Ti in the coating, the coating is particularly suitable for machining copper-aluminum alloy.