Blade root and wheel groove structure of turbine moving blade

A blade root and wheel groove structure of a turbine moving blade is disclosed. A blade root of the blade is assembled in a wheel groove of an impeller, and the contours of the blade root and the wheel groove are fir-shaped. The fir-shaped blade root has four teeth, and the contour of the transition position between the first tooth of the blade root and a blade root platform is formed by smoothly connecting through a linear section and two arc sections in different radius, wherein the connection points are tangential points. A linear line is a portion of bottom projection line of the blade root platform and is arranged in the upper side. The arc section with a large radius is arranged in the middle, and the arc section with a small radius is arranged in the lower side, wherein the large radius RN1 is 1.75 times of the small radius RN2. The fillet contour of a fourth tooth is formed by connecting of three arc sections with different radiuses in tangential manner. From top to bottom, the radius RM1 of a first arc section is 1.13 times of the RN2, the radius RM2 of a second arc section is 2.63 times of the RN2, and the radius RM3 of a third arc section is 1.44 times of the RN2. The blade root bearing capacity reaches over 1000 tons. The blade root and wheel groove structure is suitable for final-stage moving blades of super-large power turbines.