The invention relates to a sensor configuration redundancy determination method and system based on energy balance, and the method is characterized in that the method comprises the following steps: 1)constructing an energy network model of a networked system; 2) establishing a measurement equation of the energy network model according to the input and output energy balance of the nodes in the energy network model and the configuration mode of the sensors in the networked system; and 3) determining the measurement redundancy of the networked system in the sensor configuration mode according tothe non-zero row number and rank of the measurement equation coefficient matrix in the measurement equation of the energy network model. The method can be widely applied to the technical field of networked system measurement.