Power distribution device of energy storage system and energy storage system

The utility model discloses a power distribution device of an energy storage system and the energy storage system, and belongs to the technical field of energy storage. The power distribution device comprises a cabinet body, a plurality of wire harness collecting pieces and a main wiring terminal, the cabinet body comprises a bottom wall and a top wall which are oppositely arranged along a first direction, and the bottom wall is provided with a wire passing hole for an external wire to pass through. The plurality of wire harness collecting pieces are arranged in the cabinet body and divide the internal space of the cabinet body into a plurality of sub-spaces, the plurality of sub-spaces comprise a first sub-space, and the distance between the first sub-space and the bottom wall is smaller than the distance between other sub-spaces and the bottom wall in the first direction. The main wiring terminal is arranged in the first subspace and used for being connected with an external wire. Through the design, the energy density of the energy storage system is improved.