Automatic mixing device for plastic processing

The invention discloses an automatic mixing device for plastic processing, and relates to the technical field of plastic processing, the automatic mixing device comprises an impurity removal mechanism and a mixing mechanism, the impurity removal mechanism comprises a rack, and a slag removal cylinder is fixed at the top of the rack; and the material mixing mechanism comprises a material mixing box, moving plates are slidably connected to the two sides of the material mixing box, and a fixed plate is jointly connected between the two moving plates. Through rotation of the screening barrel, materials in the screening barrel are continuously rolled up and roll along the inner wall of the screening barrel so that the materials can be dispersed, the materials can be thoroughly and uniformly screened through dispersion of the materials, and the situation that due to material accumulation, part of the materials cannot be fully screened, and impurity residues are caused is avoided; through cooperation of the bottom p