The microwave sintering technology is still at the developmental stage due to the limitation of the volume (or size) and batch of the ceramic products that can be fabricated by microwave processing. The present paper introduces a new microwave processing technique, i.e. a continuous microwave sintering, which makes it possible to sinter ceramic products with an infinite length in a microwave field. By this technique, alumina-mullite ceramic rollers of 40 mm in diameter and 2400 mm in length have been successfully microwave sintered. The exploratory results show this new technique could offer some new opportunities to scale up microwave sintering for industrial applications.