Full-automatic follow-up harvester, grain collecting system and operating method

The invention relates to a full-automatic follow-up harvester, a grain collecting system and an operating method; the full-automatic follow-up harvester comprises a vehicle body; traveling mechanismsare arranged on two sides of the vehicle body; the front end of the vehicle body is provided with a harvesting mechanism, and the interior of the vehicle body is provided with a screening mechanism and a grain storage bin; one side of the grain storage bin is provided with a grain spraying mechanism connected with the grain storage bin; the vehicle body is provided with a first driving part through a first bracket, and the first driving part is connected with a turntable; the turntable can be driven to rotate in a horizontal plane, and the turntable is connected with a second driving part through a second bracket; the second driving part is connected with a grain spraying barrel and can drive the grain spraying barrel to rotate in the vertical plane; the grain spraying barrel is connectedwith the grain spraying me