Furnace bottom roller replacing device and system

The utility model discloses a furnace bottom roller replacing device which comprises a transmission side tool and an operation side tool. The transmission side tool and the operation side tool each comprise a shaft sleeve and an extension rod which are connected through a flange. Bolt holes are symmetrically formed in a shaft sleeve of the transmission side tool, and the shaft sleeve is fixed to the furnace bottom roller through bolts. Threaded holes are symmetrically formed in a shaft sleeve of the operation side tool, and the shaft sleeve is fixed to the furnace bottom roller through bolts. Special tools are arranged on the operation side and the transmission side of the furnace bottom roller, the furnace bottom roller is lengthened, a crown block and a chain hoist are fully utilized, the situation that a support is arranged in a furnace and only manual operation is needed is successfully avoided, and the effects of reducing the labor intensity and improving the working efficiency are remarkable. And person