The invention discloses a material mixing and batching device for preparing plastic films. The material mixing and batching device includes a control mechanism, a feeding mechanism, a supporting box body connected to the lower end of the feeding mechanism and internally provided with a cavity, a material checking mechanism located in the supporting box body and connected below the feeding mechanism, an unloading mechanism connected to the lower end of the material checking mechanism and a mixing mechanism located below the unloading mechanism; and the control mechanism is in communication connection with the feeding mechanism, the material checking mechanism, the unloading mechanism and the mixing mechanism, and a screw feeding mechanism communicating with the mixing mechanism is arrangedbelow the supporting box body. The material mixing and batching device is convenient and reliable to operate, has the high degree of automation and has the good use performance. The component amount is strictly controlled in the mixing process to ensure the accuracy of the mixing ratio, the quality of the produced products is ensured, the needs of the production process are effectively met, and economic benefits are improved.