Steam turbine and steam seal structure

The invention provides a steam turbine and a steam seal structure, the steam turbine comprises a rotor and a stator, at least one of the rotor and the stator is provided with a plurality of first grooves distributed in the axial direction, and notches of the first grooves face the other one; the groove surface of the first groove comprises a bottom surface and two opposite side surfaces, the side surface located on the outer side is a pressure surface, the side surface located on the inner side is a suction surface, the bottom surface is a first rotation surface, and the suction surface, the first rotation surface and the pressure surface are all concave curved surfaces. The curvature radius of the pressure face is smaller than that of the suction face, and the suction face and the pressure face incline inwards from the edges of the suction face and the pressure face respectively. And on the premise of ensuring the steam sealing effect, the safe operation of the rotor is not influenced, and the axial space ca