The invention relates to the technical field of energy supply of energy stations, and discloses an energy supply scale determination method and device based on energy consumption bodies in different commercial activities. The energy supply scale determination method comprises the following steps of: respectively obtaining first energy consumption peakloads of energy consumption bodies in different commercial activities in respective unit times, and first normalization data in respective unit times; according to the first energy consumption peakloads of the energy consumption bodies in different commercial activities in the respective unit times, and the first normalization data in the respective unit times, determining the energy consumption complementarity among the energy consumption bodies in different commercial activities; and, determining the energy supply scale of an energy station according to the energy consumption complementarity among the energy consumption bodies in different commercial activities. By means of the energy supply scale determination method and device disclosed in the embodiment of the invention, the energy consumption complementarity among the energy consumption bodies in different commercial activities is sufficiently considered; because the energy consumption complementarity is determined, the scale of the energy station for supplying energy to the energy consumption bodies in different commercial activities is determined; therefore, the energy utilization rate of the energy station can be greatly increased; and in addition, the energy supply cost of the energy station can be reduced.