Disclosed in the present application are an energy storage device and a temperature regulating structure thereof. The temperature regulating structure of the energy storage device comprises: a housing, and a temperature regulating plate fixedly connected to the housing, wherein the housing and the temperature regulating plate form a first heat insulation cavity, and/or the housing is provided with a second heat insulation cavity. In the temperature regulating structure of the energy storage device, the first heat insulation cavity is formed by the housing and the temperature regulating plate and/or the housing is provided with the second heat insulation cavity. Use of the first heat insulation cavity and the second heat insulation cavity can reduce the heat exchange of the temperature regulating plate with the outside by means of the housing, thereby reducing the impact of the external environment on the temperature regulating plate and improving the regulation efficiency of the temperature regulating plate.