Forked blade root locking structure of moving blades in high-temperature section of steam turbine

The invention discloses a forked blade root locking structure of moving blades in a high-temperature section of a steam turbine. The forked blade root structure comprises an impeller and the moving blades, wherein the moving blades are arranged on the impeller, blade roots of the moving blades are forked blade roots, assembling grooves which are matched with the forked blade roots are formed in the circumferential surface of the impeller, the blade roots of the moving blades are arranged in the assembling grooves, the moving blades are fixedly locked on the impeller by enabling a pin to penetrate through the blade roots and the impeller, and the pin is called as a core through pin and is positioned at the center positions of the blade roots; a blade root connecting seam of two adjacent moving blades is also provided with a pin, the pin penetrates through the blade roots and the impeller, and the pin which is arranged in the two adjacent blades in a crossing way is called as a seam crossing pin. According to the forked blade root locking structure of the moving blades in the high-temperature section of the steam turbine, disclosed by the invention, the heat stress can be reduced, and the safety of the blades is enhanced.