Crop sowing all-in-one machine, sowing system and working method

The invention discloses a crop sowing all-in-one machine, a sowing system and a working method, and relates to the technical field of crop sowing. Crops from an acrylic seed box are stirred through a lead screw to enable bud seedlings to face upwards, the bud seedlings come out of a pipe opening of an arc-shaped pipeline barrel, and after a seed taking cup reaches a preset position in advance, the bud seedlings are taken out from the pipe opening of the arc-shaped pipeline barrel; the mechanical arm rotates and controls a plurality of line-driven shifting pieces in the seed taking cup to stretch out and draw back so as to catch crops, when the mechanical arm rotates to the sowing position, crop bud seedlings upwards fall into soil, and the direction of the crop bud seedlings is controlled during seed placing, so that the survival rate of the crops is greatly improved; meanwhile, a spherical worm arranged at the joint of a plurality of acrylic brackets rotates to drive a rack on the inner side of each acrylic