The invention relates to a grinding device, in particular to a grinding device for raw materials for manufacturing mosaic ceramic tiles. The grinding device for the raw materials for manufacturing the mosaic ceramic tiles achieves the technical purpose that raw material grinding is thorough. In order to achieve the technical purpose, the grinding device for the raw materials for manufacturing the mosaic ceramic tiles comprises a support, a grinding box, a pressing plate, an elastic piece, a fixed stop piece, a lifting rod, a contact wheel, a large belt wheel, a motor, a cam, a first supporting rod, a flat belt, a crushing wheel, a small belt wheel, a second supporting rod, a crushing box, a filter screen and a guiding plate; the grinding box is arranged on the right side of the bottom in the support; the first supporting rod and the guiding plate are arranged on the right wall in the support; and the guiding plate is located below the first supporting rod. The grinding device for the raw materials for manufacturing the mosaic ceramic tiles achieves the effects that the raw material grinding is thorough, time and labor are saved, operation is easy, and resources are saved, and because an electric pushing rod is started to stretch out and draw back, the grinding box is driven to move leftwards and rightwards.