The invention discloses an ultra-thin raw paper making device. The ultra-thin raw paper making device comprises a cleaning portion, a net cage portion, a squeezing portion, a drying portion, a calendaring portion and a paper rolling cylinder, wherein the net cage portion comprises at least one net cage and a couch roll correspondingly matched with the net cage, the squeezing portion comprises a squeezing roller and a paper stripping roller correspondingly matched with the squeezing roller, the drying portion comprises one large cylinder and a stripping roller corresponding to the large cylinder, a paper making carpet for cyclically conveying raw paper to the large cylinder is arranged between the net cage and the squeezing roller, the cleaning portion comprises a water trough for the papermaking carpet to enter, the water trough is provided with a water extruding roller for clamping the paper making carpet on a paper making carpet leaving side, and the calendaring portion comprises atleast one calendaring roller acting on the surface of raw paper. The ultra-thin raw paper making device is suitable for ultra-thin raw paper making.