The invention discloses a method for calculating life-cycle energy consumption of power grid equipment. The method mainly includes the steps of (1) building a life-cycle energy consumption analysis model of the equipment, (2) analyzing a life-cycle energy consumption curve of the equipment, and (3) building a life-cycle energy-consumption management assessment index system of the equipment. The method for calculating the life-cycle energy consumption of the power grid equipment can overcome the defects that in the prior art, reliability is low, cost is high and energy consumption is high, and has the advantages of being high in reliability, low in cost and low in energy consumption.