The invention discloses a method and a system for measuring power consumption, and belongs to the testing field. The method for measuring power consumption adjusts the temperature of a component to betested by using a mechanical arm to clamp a temperature control device, and monitors the test temperature of the component to be tested, so as to ensure that the target current of the component to betested can be collected in case of consistent test temperature, and then to calculate the power consumption value, achieving the purpose of accurately measuring the power consumption value of the component to be tested.