Lower roller way for cutting continuous casting slab and use method

The invention relates to a lower roller way for cutting a continuous casting slab and a use method. The lower roller way comprises a front cutting roller way rack and a front cutting roller way roller and further comprises lower cutting carrier rollers arranged in the blank outlet direction and carrier roller fixing racks arranged below the lower cutting carrier rollers, wherein the lower cutting carrier rollers are oppositely arranged, a spacing is reserved between the carrier rollers, and the carrier rollers are symmetrically arranged on two sides of a flow center line through the carrier roller fixing racks and can be adjusted in position in the blank outlet direction in a front-back mode. By adopting the device and the method, the investment for the lower cutting carrier rollers can be reduced to the most degree, the maintenance amount of the lower cutting carrier rollers are decreased, meanwhile the situation that a cutting gun needs to stop and avoid the rollers when encountering the rollers can be also