The invention relates to a spinneret plate for manufacturing high-gram-weight spun-bonded hot-rolled non-woven fabrics. The spinneret plate comprises a spinneret plate body, a plurality of circular holes and a plurality of linear holes are formed in the spinneret plate body, the multiple circular holes form a circular hole area, the multiple linear holes form a linear hole area, the circular holearea is positioned on the periphery of the linear hole area, the multiple linear holes are distributed in an annular array, the extension lines of the multiple linear holes in the length direction allpass through the circle center of the annular array, and the multiple circular holes are further distributed in an annular array. A method for manufacturing the high-gram-weight spun-bonded hot-rolled non-woven fabrics is characterized by comprising the following steps of PET raw material preparation, air flow conveying, pre-crystallization, drying, spinneret plate melt spinning, cross air blow cooling, air flow drafting, yarn swinging and web forming, hot rolling reinforcement and winding. A special spinneret plate hole design with the same plate and different deniers is adopted, and two spinneret holes with different sectional areas and different shapes are formed in the same spinneret plate, so that fibers with different deniers (diameters) and different crystallinity degrees are spun.