The invention discloses a high-efficiency cutting device for small environment-friendly plate processing, which includes a cutting frame, a plate conveying bin, an air cylinder, a knife fixing plate, a cutting knife, a cutting platform, a guide sleeve, a guide column, a plate positioning mechanism, Auxiliary support device for sheet metal, the present invention sets the sheet material positioning mechanism, the upper pressure roller is driven to rotate by the pressure roller driving mechanism, and cooperates with the lower pressure roller to perform positioning and transmission before the sheet material is cut, which changes the original method of manually pushing the sheet material to cut. At the same time, it prevents the deviation of the plate during cutting, increases the cutting efficiency and improves the precision of plate cutting, and the height adjustment mechanism is set to adjust the distance between the upper and lower pressure rollers to adapt to different sizes. Plates increase practicability. At the same time, the auxiliary support device for plates is used to ensure the parallelism of the front and back of the plates during the positioning and transmission of the plates, increase the cutting accuracy and improve the efficiency.