The invention relates to a method for extracting silicon carbide, which is characterized by being composed of at least three groups of cyclones, wherein each group is composed of at least two cyclone separators which are connected in parallel; a bottom flow operating of each cyclone separator in each group is respectively connected with a bottom flow general pipe; an overflowing opening of each cyclone separator is connected with an overflowing general pipe; the bottom flow general pipe of the previous cyclone group is connected with the overflowing general pipe of the next cyclone group and a feeding tank of the cyclone; the feeding tank is respectively connected with a feeding pipe of each cyclone separator of the cyclone group through a feeding pump; a raw material pipe is communicated with the feeding tank of the middle cyclone group; semi-product silicon carbide powder liquid is discharged by the bottom flow general pipe of the tail-grade cyclone group; silicon powder liquid is discharged by the bottom flow general pipe of the first-grade cyclone group; the silicon carbide powder liquid is treated by processes of acid washing, dehydration and drying to obtain finished-product silicon carbide. According to the invention, an alkali washing link in the traditional process is reduced and the method has the advantages of low water consumption amount, great processing capability, high level and recycling rate of the finished-product silicon carbide, small occupied area and the like; and the method further has the advantages of obviously reducing the production cost, improving the economic benefits and alleviating the labor intensity of production staff.