The invention relates to a method for producing continuous shopped, coarse, staple inorganic fibres from such natural minerals and rocks as sand, quartz, reduced quartz sand stone and quartzite. The inventive method consists in melting silicon-based stone, which is used in the form of a raw material, at a temperature of 1750-1850° C., the melt being homogenated and stabilised at said temperature, in forming a decompression zone on the path of the melt flow to the discharge orifice die, in which the melt flow is shaped in the form of a strip with a thickness of 3-20 mm, and in passing said strip through the decompression zone at a speed V=(7 . . . 9)10−4 m/s. The air pressure in the decompression zone above the melt flow is maintained within a range of 0.10-0.30 Pa. The inventive device comprises a furnace for producing melt, a feeder, at the output of which a transfer chamber is mounted, a discharge orifice, a stream feeder assembly and a fibre producing mechanism. A homogenizer in the form of two cylinders, which are vertically and coaxially arranged with a gap one inside the other, is situated between the furnace and the feeder. A vertical baffle for producing a melt flow in the form of a strip is placed in the external cylinder. A clarifying chamber is provided with a unit for forming vacuum in the cavity thereof. Said invention makes it possible to increase the strength and chemical resistance of produced fibres by providing conditions for reducing the number of foreign, in particular, gaseous inclusions.