A guide rail plate for top drive of a drilling system, including a guide rail plate consisting of 5-7 guide rail sections, characterized in that there is a boss and a mated recess on a surface of an upper guide rail section and an opposite surface of a lower guide rail section interconnected with the upper guide rail section. A hydraulic cylinder is centrally and longitudinally fixed at the lower end of the upper guide rail section. A cone plate is connected to the lower end of a piston of the hydraulic cylinder. The right and left sides of the cone plate are connected with lock shafts. The lock shafts are placed in corresponding transverse lock shaft holes of the upper and lower guide rail sections.