The invention, which belongs to the scheduling automation field of the power system, discloses a hyperbolic cosine type robust state estimation method for a power system state. The method comprises: an injected circuit active power, an injected circuit reactive power, a branch active power, and a branch reactive power of a power system node and a node voltage amplitude parameter are extracted; a hyperbolic cosine type robust state estimation model is established; and the hyperbolic cosine type robust state estimation model is solved by using a primal-dual interior-point algorithm. The calculation example analysis demonstrates that a plurality of bad data including data with poor consistency can be suppressed effectively during the estimation process, so that the good robustness is displayed. Moreover, the calculation efficiency is improved; and the method is suitable for practical engineering application.