The invention relates to the field of steam turbine components and parts, aims to reduce or avoid the influence of resonance of steam turbine impellers, and provides a steam turbine impeller. The steam turbine impeller comprises a wheel disc and a plurality of blades connected in the circumferential direction of the wheel disc, wherein each blade comprises a blade root, a blade body and a blade crown; two kinds of blades are arranged, the widths of the blade bodies of the two kinds of blades are different; and the two kinds of blades are arranged on the wheel disc at intervals. The steam turbine impeller has the beneficial effect that the influence of resonance of the whole structure can be avoided.