The utility model discloses an adjustable ramp plate for a cutting part of a coal cutter. The adjustable ramp plate is characterized by comprising a rocker arm and a ramp plate mechanism, wherein the ramp plate mechanism comprises a ramp plate body, a fixed plate, a group of lifting hydraulic cylinders and a group of aligning hydraulic cylinders; the fixed plate is connected with the rocker arm through a ball hinge; the lifting hydraulic cylinders are arranged inside a mounting groove in the fixed plate; one end of the lifting hydraulic cylinder is fixed with the fixed plate through a pin; the other end is hinged with the ramp plate; one end of each aligning hydraulic cylinder is hinged with the fixed plate; the other end is hinged with the rocker arm; the ramp plate body and the fixed plate form a slide rail slide block mechanism. The ramp plate mechanism provided by the utility model is easy to install and flexible in structure and can be applicable to a cutting rocker arm of the coal cutter of any model number, automatic cleaning of stacked coal petrography is achieved, obstacle on walking of the coal cutter caused by the stacked coal petrography is avoided, the resistance caused when a scraper conveyer is pushed forwards is reduced, and the coal charging effect of the coal cutter is improved.