The invention relates to a resin surface layer and a manufacturing method thereof, a composite material with the resin surface layer and a manufacturing method thereof. The method for manufacturing the resin surface layer comprises the following steps: (a) providing a base material which is made of resin and contains a plurality of added particles; (b) continuously moving the base material and providing a magnetic field generation device for generating an external magnetic field which has nonuniform distribution of magnetic field intensity and is applied on the base material so as to change an arrangement mode of the added particles; and (c) drying the base material to allow the surface of the base material to display the visual effect of three-dimensional vein. Therefore, the arrangementmode of the added particles is controlled by the external magnetic field to achieve the visual effect of any 3D vein.