Rock wool board, based on selected basalt as main raw material quality, the day after melting, the use of advanced centrifuge system of four-roller cotton process, the basaltic rocks in high-temperature melt of cotton pulled into 4 ~ 7μm rejection of non-continuous fibers, and then rock wool fibers in a certain amount of binder, dust oil, water-repellent agent, after settlement, curing, cutting and other processes, according to the different uses made of different density products.