The invention discloses a same-direction linear three-screw full-automatic production line for sealant, and relates to the field of chemical machine-sealant automatic production. The full-automatic production line comprises three screws, a speed change gear box, a side feeder, a vacuum buffer tank and a static mixer. The right end of the speed change gear box is provided with the side feeder, theside feeder is connected with a plurality of metering tanks at the upper end, the right end of the lower portion of the three screws is provided with the connected vacuum buffer tank, the right end ofthe three screws is sequentially provided with a condenser, a middle storage tank and the static mixer, and the condenser, the middle storage tank and the static mixer are sequentially connected through pipes, so that the three screws are sequentially divided into a feeding conveying zone, a kneading zone, a vacuuming zone, a vacuum kneading zone, a lowering zone, a splitting feeding zone and a dispersing conveying zone; and the same-direction linear three-screw full-automatic production line has the better diversion effect and more shearing time numbers, and therefore better distribution mixing and dispersion mixing are achieved.