The invention provides a stir-ranking mechanism used for a straw collecting machine. The stir-ranking mechanism comprises a stir-ranking roller, a stir-ranking main shaft, a stir-ranking swing rod anda roller rotating disk, wherein the stir-ranking roller comprises a shoveling-picking base, a roller wall plate A, a roller wall plate B, a wall plate connecting frame and a rib plate; the roller wall plate A and the roller wall plate B are respectively arranged at two sides of the shoveling-picking base; the wall plate connecting frame is arranged between the roller wall plate A and the roller wall plate B and arranged at a position located at the front ends of the roller wall plate A and the roller wall plate B; the inner side of the front end of the roller wall plate A is provided with a groove disk cam and a drag-wheel crank assembly; and the stir-ranking swing rod is provided with a plurality of stir-ranking rods. According to the invention, by adoption of a mode of movements of combing, aligning, ranking and squeezing, neat straws are ranked and squeezed out of a stir-ranking chamber; and through continuous movement of a cam system and the stir-ranking roller, the neat straws are continuously ranked into a push-compressing chamber.