The invention discloses a carrying blank rolling method for producing a steel plate of the 6mm-thickness limit specification through a medium-thickness plate. A blank B of the conventional productionspecification is adopted for carrying a steel plate blank A of the limit specification, the blank B and the steel plate blank A are fed in a heating furnace at the same time to be heated, and the blank B and the steel plate blank A are separated through a separator after being discharged out of the furnace to be rolled respectively. Compared with the prior art, the method has the beneficial effects that in the carrying blank rolling method for producing the steel plate of the 6mm-thickness limit specification through the medium-thickness plate, the method that the conventional blank carries the blank of the limit length specification to implement carrying blank heating and rolling is completed through discharge blank separation is adopted, the problem that blank specifications are limitedand cannot be suitable for the normal blank mounting size of the heating furnace can be solved, meanwhile, the rolling danger existing in rolling of steel plates of the limit thin specification and damage to equipment are avoided, and existing thick plate production equipment is utilized for producing the steel plates of the limit thin specification.